Add Phase 8B browser backend contract matrix
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# HyperTwist Phase 8B browser-client backend contract matrix packet
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Created on `2026-06-19`
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## Status
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- first-party HyperTwist packet
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- bounded spec-only `Phase 8B` backend-contract continuation
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- no implementation widening is granted by this packet
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## Purpose
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This packet turns the already-frozen optional full-browser client branch into a
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more exact first-party backend contract matrix without reopening topology or
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starting runtime implementation.
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The granted slice is:
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- define the transport-neutral operation families a later browser client may
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use above Unreal backend authority
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- bind the minimum identity, freshness, and authority facts to already-owned
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first-party browser and tiling state envelopes
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- define replay, persistence, continuity-push, and runtime-health semantics
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tightly enough that a later implementation packet does not need to restate
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contract truth from scratch
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It is not:
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- a live HTTP, WebSocket, or SSE implementation packet
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- a replacement for the landed embedded browser/CEF shipping posture
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- permission to widen into public hosting, auth, or offline-first mutation
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- permission to widen into native `MagicTile` renderer ownership
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## Current authority basis
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This packet stands on:
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- `docs/ops/HYPERTWIST_COMPREHENSIVE_RECONSTRUCTION_ROADMAP_2026-06-10.md`
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- `docs/v6_5_deep_manual_pack/HyperTwist/ROADMAP.md`
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- `docs/v6_5_deep_manual_pack/HyperTwist/ARCHITECTURE.md`
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- `docs/v6_5_deep_manual_pack/HyperTwist/FEATURE_REGISTRY.md`
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- `docs/ops/HYPERTWIST_IMPLEMENTATION_PHASE_1_KICKOFF.md`
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- `docs/arch/HYPERTWIST_PHASE8B_OPTIONAL_FULL_BROWSER_CLIENT_HTTP_BACKEND_PREPARATION_PACKET_2026-06-19.md`
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- `docs/arch/HYPERTWIST_PHASE8B_BROWSER_CLIENT_SPEC_EVIDENCE_HARDENING_PACKET_2026-06-19.md`
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## Current evidence basis
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The current first-party lane already owns the concrete payload anchors that a
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later browser-client backend contract must preserve:
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- `Content/Browser/src/runtime/bridge.ts` currently emits browser envelopes as
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`{ type, payload, emittedAtUtc }`, receives `hypertwist-command` plus
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`hypertwist-shell-state`, and emits `hypertwist-state`,
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`hypertwist-command-result`, and `hypertwist-runtime-ready`
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- `FHyperTwistTrainingTilingStateEnvelope` already carries the authoritative
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state-snapshot identity chain through `SchemaVersion`, `HostDecisionId`,
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`BridgeContractId`, `SessionId`, `PuzzleFamilyId`, `PuzzleDefinitionId`,
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`TransportKind`, shared scramble data, `PuzzleState`, `TimerState`,
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`SourceRuntime`, and `CapturedAtUtc`
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- `FHyperTwistBrowserRuntimeReadyPayload` already carries the authoritative
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runtime-ready facts through `Status`, `Runtime`, `Mode`, `AdapterCount`,
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`ShellAuthority`, and queue counts
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- `FHyperTwistBrowserRuntimeStatusEnvelope` and
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`FHyperTwistBrowserRuntimeStatusSnapshot` already carry typed runtime-health
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facts through runtime identifiers, bootstrap or ready timestamps, shell
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authority, adapter count, queue carryover, bridge receive counts, last
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receipt timestamps, traffic status, and fallback reason
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## Contract posture
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Any later browser-client implementation must stay transport-neutral at the
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spec level:
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- the browser client may speak over HTTP request or response plus optional
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push transport
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- operation names below are capability labels, not mandated URL paths
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- field names may adapt per transport, but the carried first-party facts may
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not be dropped
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- Unreal remains authoritative for session truth, puzzle legality, timer
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continuity, replay, and persistence
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- browser-side buffering remains display-only and reconnect must rehydrate from
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authoritative Unreal state
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## Canonical operation matrix
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| Family | Canonical operation labels | Minimum carried facts | Authoritative response or push anchor |
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| --- | --- | --- | --- |
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| Catalog | `catalog.list` | client capability posture, requested browser-capable surfaces | launchable puzzle families, mode identifiers, browser-capable surface identifiers, bounded contract identifiers when applicable |
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| Session | `session.open`, `session.resume`, `session.close`, `session.inspect` | session identity where present, requested puzzle or mode identity, bounded launch posture | authoritative `SessionId`, `HostDecisionId`, `BridgeContractId`, `PuzzleFamilyId`, `PuzzleDefinitionId`, and initial or current state snapshot |
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| Action submission | `session.command.submit` | `SessionId`, client correlation token, bounded action or intent payload | authoritative accept or reject result, reason when rejected, and follow-on state or continuity facts when state changed |
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| State snapshot | `session.state.get` | `SessionId` | transport form of the owned `FHyperTwistTrainingTilingStateEnvelope` fact set |
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| Continuity push | `session.state.push` | `SessionId`, active continuity subscription posture | authoritative timer, replay, run-phase, and training continuity updates that remain session-matched and freshness-checked |
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| Replay | `session.replay.list`, `session.replay.get`, `session.replay.persist` | `SessionId` or replay identity | authoritative replay metadata, event ordering, playback state, and persistence results |
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| Persistence status | `session.persistence.status` | `SessionId` or save or restore identity | authoritative save, restore, validation, or recovery outcome facts |
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| Runtime health | `runtime.health.get`, `runtime.health.push` | current runtime or shell posture when needed | transport form of the owned `hypertwist-runtime-ready` and `browser-runtime-status` fact sets |
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## Minimum cross-transport metadata expectations
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Any later implementation packet must preserve these minimum facts at the
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transport or envelope layer:
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1. operation or message family identity
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2. session identity for any stateful exchange
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3. backend contract or host identity when the exchange depends on a selected
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runtime bridge
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4. correlation identity for request or response and action or result pairing
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5. capture or emission timestamp suitable for freshness checks
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6. authoritative source identity for runtime-health or status facts
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Current anchor rule:
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- the embedded browser lane already owns `type`, `emittedAtUtc`,
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`HostDecisionId`, `BridgeContractId`, `SessionId`, `CapturedAtUtc`,
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`RuntimeStatusId`, and shell-authority/runtime-ready facts
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- later transport packets may rename those fields, but they may not erase the
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underlying first-party identity chain
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## Owned payload anchors
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### Authoritative state snapshot
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The later browser-client branch must treat the current
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`FHyperTwistTrainingTilingStateEnvelope` fact set as the minimum owned state
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snapshot anchor.
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That means later transport forms must continue to preserve:
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- state schema identity
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- host decision identity
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- bridge contract identity
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- session identity
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- puzzle family and definition identity
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- transport kind
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- shared scramble data
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- full puzzle state
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- full timer state
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- source runtime identity
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- capture timestamp
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### Runtime-ready and runtime-health
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The later browser-client branch must treat the current
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`hypertwist-runtime-ready` and `browser-runtime-status` facts as the minimum
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owned runtime-health anchor.
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That means later transport forms must continue to preserve:
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- ready versus waiting or fallback posture
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- runtime or mode identity
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- shell authority
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- adapter count
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- queued-command and queued-shell-state carryover at runtime ready
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- bootstrap or runtime-ready timestamps where available
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- bridge receive counts and last receipt timestamps where available
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- fallback reason where present
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### Command result
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The current lane does not yet expose an Unreal-typed dedicated
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`hypertwist-command-result` struct, so a later implementation packet must still
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preserve at least:
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- session identity
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- action or request correlation identity
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- authoritative accept or reject outcome
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- rejection or failure reason when applicable
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- any authoritative follow-on state or continuity reference when the action was
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applied
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## Freshness, replay, and reconnect rules
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The later browser-client branch must obey these rules:
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1. a browser client must not treat locally buffered state as authoritative
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after disconnect
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2. reconnect must rehydrate from authoritative Unreal snapshot or inspect
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surfaces before fresh browser mutation is treated as current
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3. state for one `SessionId` must never be applied to another `SessionId`
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4. a changed `HostDecisionId` or `BridgeContractId` must invalidate stale
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browser-held state for the prior bridge selection
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5. older authoritative state, identified by carried capture or emission
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freshness facts, must not displace newer same-session state
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6. replay metadata, event ordering, and persistence acceptance remain backend
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authority rather than browser-derived truth
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## Explicit deferrals
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This packet still keeps the following deferred:
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- live backend route or controller implementation
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- auth, accounts, and public deployment posture
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- offline-first mutation or merge arbitration
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- browser-owned save acceptance
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- browser-owned replay truth
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- any native renderer widening
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## Acceptance criteria
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- the optional full-browser client branch now records transport-neutral
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operation labels rather than only seam-family names
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- the packet binds later transport work to the owned first-party state and
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runtime-health envelopes already present in code
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- the packet records minimum correlation, freshness, and reconnect rules
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without claiming implementation
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- roadmap, architecture, feature-registry, and kickoff docs are updated to
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reflect this tighter spec posture
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## Validation target
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Validate this packet through doc-consistency only:
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1. the earlier `Phase 8B` preparation and seam-hardening packets must remain
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consistent with this contract matrix
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2. roadmap, architecture, feature-registry, and kickoff docs must agree on the
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new backend-contract posture
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3. no Unreal build, browser-client runtime, or packaging proof may be inferred
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from this document alone
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## Queue effect
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If this packet lands cleanly:
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- the optional full-browser client branch remains bounded and deferred, but it
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now has a concrete first-party backend contract matrix
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- any future implementation packet can scope itself against explicit operation,
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identity, freshness, and runtime-health rules instead of re-opening those
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questions
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- the branch remains separate from current embedded-browser shipping work and
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from any native renderer widening branch
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@ -442,6 +442,7 @@ Closure read:
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- [ ] Alternative: full browser client with HTTP API to UE backend
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- Spec-only branch frozen on `2026-06-19`: `docs/arch/HYPERTWIST_PHASE8B_OPTIONAL_FULL_BROWSER_CLIENT_HTTP_BACKEND_PREPARATION_PACKET_2026-06-19.md` now defines this as an optional first-party browser-owned client above explicit Unreal backend authority; the currently landed shipping posture remains the embedded browser/CEF shell, the adjacent `Phase 7C` native behavior proof is now landed separately, and any later full-browser-client implementation stays deferred on a branch that remains separate from the `Phase 7D` native renderer-port decision gate
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- Spec/evidence continuation on `2026-06-19`: `docs/arch/HYPERTWIST_PHASE8B_BROWSER_CLIENT_SPEC_EVIDENCE_HARDENING_PACKET_2026-06-19.md` now tightens that optional branch into explicit first-party seam families for catalog, session, action, state, continuity push, replay, persistence status, and runtime-health transport, reuses the currently owned transport-neutral browser vocabulary only where it remains first-party, and keeps offline-first, public-hosted, and native-renderer widening posture explicitly deferred
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- Backend-contract continuation on `2026-06-19`: `docs/arch/HYPERTWIST_PHASE8B_BROWSER_CLIENT_BACKEND_CONTRACT_MATRIX_PACKET_2026-06-19.md` now fixes the transport-neutral operation labels, minimum identity or correlation facts, state freshness and reconnect rules, and the code-grounded payload anchors for state snapshot, runtime-ready, and runtime-health ownership that any later full-browser-client implementation must preserve
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**Estimated actions:** 50–80
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**Estimated time:** 3–5 days
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@ -132,6 +132,7 @@ Use these as the current governing docs:
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- the optional full-browser client path is now frozen as a spec-only first-party branch in:
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- [HYPERTWIST_PHASE8B_OPTIONAL_FULL_BROWSER_CLIENT_HTTP_BACKEND_PREPARATION_PACKET_2026-06-19.md](C:/HyperTwist/docs/arch/HYPERTWIST_PHASE8B_OPTIONAL_FULL_BROWSER_CLIENT_HTTP_BACKEND_PREPARATION_PACKET_2026-06-19.md:1)
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- [HYPERTWIST_PHASE8B_BROWSER_CLIENT_SPEC_EVIDENCE_HARDENING_PACKET_2026-06-19.md](C:/HyperTwist/docs/arch/HYPERTWIST_PHASE8B_BROWSER_CLIENT_SPEC_EVIDENCE_HARDENING_PACKET_2026-06-19.md:1)
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- [HYPERTWIST_PHASE8B_BROWSER_CLIENT_BACKEND_CONTRACT_MATRIX_PACKET_2026-06-19.md](C:/HyperTwist/docs/arch/HYPERTWIST_PHASE8B_BROWSER_CLIENT_BACKEND_CONTRACT_MATRIX_PACKET_2026-06-19.md:1)
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- current shipping/browser posture remains the landed embedded browser/CEF shell
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- that same shipping/browser posture now also has a typed Unreal-side
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`browser-runtime-status` capture seam through the browser bridge/widget,
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@ -153,6 +154,7 @@ Use these as the current governing docs:
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- Validation evidence on `2026-06-19`: the same primary reverse-SSH `localhost:22022` lane rebuilt isolated worktree `C:\HyperTwist_worktrees\phase10validate` with `Result: Succeeded` and UnrealBuildTool `Total execution time: 3258.26 seconds`, then `Automation RunTests HyperTwist.Browser` exported `Saved\AutomationReports\Browser-NativeOperatorDiagnosticsPanel-Verify\index.json` with `14` `HyperTwist.Browser.*` tests succeeded and `0` failed, including `CoachDashboard.RuntimeInspectSurface` and `TrainingPanel.RuntimeInspectSurface`
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- that same shipping/browser posture now also carries typed browser bootstrap/runtime-ready timestamps, last command and shell-state receipt timestamps, and fallback reason through the native operator and training/dashboard inspect seams, so Unreal-side diagnostics mirror the authoritative browser runtime status surface more faithfully without reopening topology
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- Validation evidence on `2026-06-19`: the same primary reverse-SSH `localhost:22022` lane rebuilt isolated worktree `C:\HyperTwist_worktrees\phase10validate` with `Result: Succeeded` and UnrealBuildTool `Total execution time: 3261.17 seconds`, then `Automation RunTests HyperTwist.Browser` exported `Saved\AutomationReports\Browser-NativeOperatorTimelineFidelity-Verify\index.json` with `14` `HyperTwist.Browser.*` tests succeeded and `0` failed, including `CoachDashboard.RuntimeInspectSurface`, `TrainingPanel.RuntimeInspectSurface`, and `Widget.OperatorStatusSurfaceLive`
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- the same optional full-browser-client branch is now also tightened by a backend-contract matrix packet that fixes transport-neutral operation labels, minimum session or host or bridge identity facts, request or result correlation posture, freshness or reconnect rules, and the owned state/runtime payload anchors a later browser-client implementation must preserve
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- `MagicTile` `Phase 7C` is now landed separately through the bundled tiling native-behavior
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proof contract/probe seam, runtime-library proof helpers, and focused Windows validation on
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isolated worktree `C:\HyperTwist_worktrees\phase10validate`
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@ -148,6 +148,14 @@ first-party branch:
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- any later implementation must stay inside explicit first-party seam families
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for catalog, session, action submission, state snapshot, continuity push,
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replay, persistence status, and runtime health
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- any later implementation must also preserve the current first-party identity
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and freshness chain from the owned browser/runtime envelopes, including
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session identity, host decision identity, bridge contract identity,
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correlation posture, authoritative capture or emission timing, and
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runtime-health source facts
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- the minimum owned payload anchors for that later branch are the current
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tiling state envelope plus the current `hypertwist-runtime-ready` and
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`browser-runtime-status` fact sets rather than a new browser-only schema
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- reconnect must rehydrate from authoritative Unreal state; offline-first
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browser-side mutation authority remains deferred
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- this is not current shipping posture, not a general browser-first rewrite,
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@ -157,6 +165,7 @@ Canonical spec note:
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- `C:\HyperTwist\docs\arch\HYPERTWIST_PHASE8B_OPTIONAL_FULL_BROWSER_CLIENT_HTTP_BACKEND_PREPARATION_PACKET_2026-06-19.md`
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- `C:\HyperTwist\docs\arch\HYPERTWIST_PHASE8B_BROWSER_CLIENT_SPEC_EVIDENCE_HARDENING_PACKET_2026-06-19.md`
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- `C:\HyperTwist\docs\arch\HYPERTWIST_PHASE8B_BROWSER_CLIENT_BACKEND_CONTRACT_MATRIX_PACKET_2026-06-19.md`
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- `C:\HyperTwist\docs\arch\HYPERTWIST_PHASE7D_MAGICTILE_RENDERER_PORT_DECISION_PACKET_2026-06-19.md`
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The narrow first-party `MagicTile` native behavior proof is now landed as the
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@ -145,7 +145,7 @@ Do not collapse those three tiers into one undifferentiated "features" voice.
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| Analytics/reporting surfaces | Implemented now | landed analytics/reporting packets | Reporting is real, but bounded to accepted retained slices. |
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| Rewritten training analytics and report reference grounding | Implemented now | `apache/echarts` retained permissive lane + first-party current code | Current live `Training Analytics` reference side includes four rewritten first-party targets grounded in retained `apache/echarts`: session outcome and progress reporting, analytics data-view and export, timing-trend history and overview interaction, and the optional richer explainer or sidecar boundary. This does not displace the landed `Phase 3R-C` first-party analytics/reporting owner or elevate `ecomfe/echarts-gl` and `ecomfe/zrender` beyond support-only sidecars. |
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| Browser/spatial/media adjunct surfaces | Implemented now | landed `three.js`, `react-three-fiber`, `xr`, `model-viewer`, `remotion` packets | These are implemented bounded families, and the current Phase 1 browser-runtime landing now includes a first-party authoritative `Content/Browser/index.html` shell, bundled-runtime upgrade path, committed clean-checkout plain-JS fallback runtime, embedded `UHyperTwistBrowserWidget` bridge, the `2026-06-19` runtime-ready queue hardening that retains outbound Unreal shell traffic until the browser runtime is ready, a same-day first-party `Browser Runtime Status` surface with shared boot-state ownership across bundled and fallback shells, a follow-on typed Unreal-side `browser-runtime-status` capture seam that retains the last valid runtime snapshot across unrelated later envelope traffic until explicit reset, a second follow-on typed Unreal-side `hypertwist-runtime-ready` capture seam that raises the original handshake payload out of raw JSON-only handling without changing queue flush behavior, a third same-day native/operator-facing status surface that consumes those typed seams inside Unreal while clearing retained runtime ownership on shell-authority change, a fourth same-day native training/operator diagnostics-panel continuation that wires that typed status ownership into `UHyperTwistTrainingPanelWidget` and the coach dashboard without making the dashboard inspect seam depend on stale rendered strings, and a fifth same-day diagnostics-fidelity continuation that now carries bootstrap/runtime-ready timestamps, last command/shell-state receipt timestamps, and fallback reason through the same native operator/training seams. This still is not proof of unlimited browser-shell parity. |
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| Optional full-browser client path above Unreal backend authority | Deep-source grounded retained | landed first-party `Phase 8B` preparation packet + spec/evidence continuation | This branch remains a spec-only first-party option: a browser-owned rendering and input shell may sit above explicit Unreal backend seams while Unreal remains authoritative for puzzle, training, timer, replay, and persistence state. The current continuation now fixes the allowed seam families to catalog, session, action, state, continuity push, replay, persistence status, and runtime health, while keeping offline-first, public-hosted, and native renderer widening posture deferred. The landed embedded browser/CEF shell remains the current shipping posture, and this branch stays separate from any native `MagicTile` behavior or renderer widening. |
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| Optional full-browser client path above Unreal backend authority | Deep-source grounded retained | landed first-party `Phase 8B` preparation packet + spec/evidence continuation + backend-contract continuation | This branch remains a spec-only first-party option: a browser-owned rendering and input shell may sit above explicit Unreal backend seams while Unreal remains authoritative for puzzle, training, timer, replay, and persistence state. The current continuation now fixes the allowed seam families to catalog, session, action, state, continuity push, replay, persistence status, and runtime health, then further fixes transport-neutral operation labels, minimum identity or freshness requirements, and the owned state/runtime payload anchors that any later browser-client backend implementation must preserve. The landed embedded browser/CEF shell remains the current shipping posture, and this branch stays separate from any native `MagicTile` behavior or renderer widening. |
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| Rewritten browser spatial scene and renderer reference grounding | Implemented now | `mrdoob/three.js` retained permissive lane + first-party current code | Current live `Browser 3D and XR Support` reference side includes one rewritten first-party target grounded in retained `mrdoob/three.js`: the browser spatial scene and renderer contract. This does not displace the landed `Phase 3R-F` first-party browser spatial owner trio or absorb the adjacent `react-three-fiber` renderer-bridge and `xr` session slices. |
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| Rewritten React-side browser renderer and event-bridge grounding | Implemented now | `pmndrs/react-three-fiber` retained permissive lane + first-party current code | Current live `Browser 3D and XR Support` reference side includes one rewritten first-party target grounded in retained `react-three-fiber`: the React scene renderer and event bridge. This does not displace the landed `Phase 3R-F` first-party browser spatial owner trio or absorb the adjacent `three.js` scene substrate and `xr` session slices. |
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| Rewritten browser XR session and immersive-interaction grounding | Implemented now | `pmndrs/xr` retained permissive lane + first-party current code | Current live `Browser 3D and XR Support` reference side includes one rewritten first-party target grounded in retained `pmndrs/xr`: the browser XR session and immersive interaction contract. This does not displace the landed `Phase 3R-F` first-party browser spatial owner trio or absorb the adjacent `three.js` scene substrate and `react-three-fiber` renderer-bridge slices. |
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@ -44,6 +44,11 @@ Current consolidated milestone snapshot:
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`C:\HyperTwist\docs\arch\HYPERTWIST_PHASE8B_BROWSER_CLIENT_SPEC_EVIDENCE_HARDENING_PACKET_2026-06-19.md`
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now fixes the allowed first-party seam families and keeps offline-first plus
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native-renderer widening explicitly deferred;
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the further additive continuation
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`C:\HyperTwist\docs\arch\HYPERTWIST_PHASE8B_BROWSER_CLIENT_BACKEND_CONTRACT_MATRIX_PACKET_2026-06-19.md`
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now fixes transport-neutral operation labels, state/runtime payload anchors,
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and minimum identity or freshness rules for any later browser-client backend
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||||
packet;
|
||||
the landed embedded browser/CEF shell remains current shipping posture
|
||||
- `MagicTile` `Phase 7C` is now also closed through a first-party native behavior proof contract
|
||||
and proof probe for selected-cell focus, candidate-twist disambiguation, preview, commit or
|
||||
|
|
@ -230,6 +235,8 @@ Current consolidated milestone snapshot:
|
|||
`C:\HyperTwist\docs\arch\HYPERTWIST_PHASE8B_OPTIONAL_FULL_BROWSER_CLIENT_HTTP_BACKEND_PREPARATION_PACKET_2026-06-19.md`,
|
||||
with the additive seam-hardening continuation in
|
||||
`C:\HyperTwist\docs\arch\HYPERTWIST_PHASE8B_BROWSER_CLIENT_SPEC_EVIDENCE_HARDENING_PACKET_2026-06-19.md`,
|
||||
plus the additive backend-contract continuation in
|
||||
`C:\HyperTwist\docs\arch\HYPERTWIST_PHASE8B_BROWSER_CLIENT_BACKEND_CONTRACT_MATRIX_PACKET_2026-06-19.md`,
|
||||
while the optional native renderer branch is now separately frozen behind
|
||||
the spec-only `Phase 7D` decision packet in
|
||||
`C:\HyperTwist\docs\arch\HYPERTWIST_PHASE7D_MAGICTILE_RENDERER_PORT_DECISION_PACKET_2026-06-19.md`
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue