# HyperTwist Phase 4R Packet 4R-D PostHog Control-Plane Implementation

Created on `2026-05-13`

## Status

`Phase 4R / Packet 4R-D` is now `closed`.

This packet converts the retained boundary-sensitive `PostHog/posthog` row from a queued replay, telemetry, and feature-governance donor into a landed first-party HyperTwist control-plane lane.

It does not reopen `Phase 0R`, `Phase 1R`, `Phase 2R`, `Phase 3R`, `Phase 4R-A`, `Phase 4R-B`, or `Phase 4R-C`.

Those earlier packets still own:

- source-value extraction
- retained-set routing
- ownership and acceptance boundaries
- landed browser viewer, browser spatial, classic-cubing, legacy `4D`, and shared-assets owner decisions

This packet owns the next question instead:

- what first-party control-plane implementation actually landed
- how the retained PostHog value was reduced to replay diagnostics, feature governance, scheduled changes, early-access rollout, and compliance boundaries
- how the `ee/` subtree stayed excluded
- what validation was completed
- what the next bounded move is after this landing

## Authority order

For future work on the PostHog boundary-sensitive lane, read in this order:

1. this packet for landed control-plane scope, `ee/` exclusion result, and validation result
2. [HYPERTWIST_LIVE_LANES_SOURCE_AND_PRESERVATION_AUDIT_2026-05-13.md](C:/HyperTwist/docs/HYPERTWIST_LIVE_LANES_SOURCE_AND_PRESERVATION_AUDIT_2026-05-13.md:1) for live-lane preserve posture
3. [HYPERTWIST_PHASE_1R_RETAINED_SET_CONTRACT_AND_HANDOFF_2026-05-13.md](C:/HyperTwist/docs/HYPERTWIST_PHASE_1R_RETAINED_SET_CONTRACT_AND_HANDOFF_2026-05-13.md:1) for retained-set routing
4. [HYPERTWIST_PHASE_0R_PACKET_0R_C_EVALUATION_2026-05-12.md](C:/HyperTwist/docs/HYPERTWIST_PHASE_0R_PACKET_0R_C_EVALUATION_2026-05-12.md:1) for source-value extraction and non-promotion rationale
5. [HYPERTWIST_MODEL_A_MAX_VALUE_EXTRACTION_MODUS_OPERANDI_2026-05-13.md](C:/HyperTwist/docs/HYPERTWIST_MODEL_A_MAX_VALUE_EXTRACTION_MODUS_OPERANDI_2026-05-13.md:1) for the canonical interpretation rule that keeps future `Model A` extraction rich rather than shallow
6. [REPO_LICENSE_TRACKING.md](C:/HyperTwist/docs/REPO_LICENSE_TRACKING.md:1) for path-level license, subtree, notice, and provenance obligations

## Packet licensing snapshot

Owner row widened by this packet:

- `PostHog/posthog`: `MIT` outside `ee/`; enterprise license inside `ee/`

Checked local notice and boundary surfaces:

- [README.md](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/README.md:1)
- [LICENSE](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/LICENSE:1)
- [ee/LICENSE](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/ee/LICENSE:1)

Checked retained source surfaces:

- [frontend/src/scenes/session-recordings/utils/replayCaptureDiagnostics.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/frontend/src/scenes/session-recordings/utils/replayCaptureDiagnostics.ts:1)
- [products/replay/skills/diagnosing-missing-recordings/references/diagnostic-signals.md](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/products/replay/skills/diagnosing-missing-recordings/references/diagnostic-signals.md:1)
- [frontend/src/scenes/session-recordings/player/utils/segmenter.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/frontend/src/scenes/session-recordings/player/utils/segmenter.ts:1)
- [frontend/src/scenes/session-recordings/player/utils/player-logging.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/frontend/src/scenes/session-recordings/player/utils/player-logging.ts:1)
- [frontend/src/scenes/feature-flags/featureFlagReleaseConditionsLogic.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/frontend/src/scenes/feature-flags/featureFlagReleaseConditionsLogic.ts:1)
- [frontend/src/scenes/feature-flags/featureFlagScheduleEditLogic.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/frontend/src/scenes/feature-flags/featureFlagScheduleEditLogic.ts:1)
- [frontend/src/scenes/feature-flags/activityDescriptions.tsx](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/frontend/src/scenes/feature-flags/activityDescriptions.tsx:1)
- [products/feature_flags/backend/models/team_feature_flag_defaults_config.py](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/products/feature_flags/backend/models/team_feature_flag_defaults_config.py:1)
- [products/early_access_features/backend/models.py](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/products/early_access_features/backend/models.py:1)
- [products/early_access_features/backend/api.py](C:/Workspaces/HyperTwist/mirrors/restrictive/PostHog/posthog/products/early_access_features/backend/api.py:1)

Boundary result:

- no donor `ee/` files were copied into first-party owned source in this packet
- no claim was made that the whole PostHog product shell is now live in HyperTwist
- the landed surface is a first-party Unreal control-plane contract and runtime API that preserves bounded replay-diagnostic, feature-governance, scheduled-change, and early-access value

## Packet result

`4R-D` lands the PostHog row as:

- `PostHog/posthog` -> `implemented_live_boundary_sensitive`

Current portfolio effect:

- curated HyperTwist shallow-eval set: `71`
- currently verified live in checked Unreal surfaces: `18`
- live permissive lanes: `13`
- live boundary-sensitive lanes: `4`
- live restrictive clean-room lanes: `1`
- active non-live implementation-board rows: `41`

## First-party landing surfaces

The landed first-party Unreal surfaces are:

- [HyperTwistTrainingControlPlaneLibrary.h](C:/HyperTwist/UnrealHyperTwist/Source/UnrealHyperTwist/Public/HyperTwistTraining/HyperTwistTrainingControlPlaneLibrary.h:1)
- [HyperTwistTrainingControlPlaneLibrary.cpp](C:/HyperTwist/UnrealHyperTwist/Source/UnrealHyperTwist/Private/HyperTwistTraining/HyperTwistTrainingControlPlaneLibrary.cpp:1)
- [HyperTwistTrainingRuntimeLibrary.h](C:/HyperTwist/UnrealHyperTwist/Source/UnrealHyperTwist/Public/HyperTwistTraining/HyperTwistTrainingRuntimeLibrary.h:1)
- [HyperTwistTrainingRuntimeLibrary.cpp](C:/HyperTwist/UnrealHyperTwist/Source/UnrealHyperTwist/Private/HyperTwistTraining/HyperTwistTrainingRuntimeLibrary.cpp:1)
- [hypertwist-reference-incorporation-targets.json](C:/HyperTwist/UnrealHyperTwist/Content/HyperTwistTraining/MaterializedCatalog/hypertwist-reference-incorporation-targets.json:1)
- [hypertwist-catalog-materialization-summary.json](C:/HyperTwist/UnrealHyperTwist/Content/HyperTwistTraining/MaterializedCatalog/hypertwist-catalog-materialization-summary.json:1)
- [posthog-posthog-control-plane-reference-pages.jsonl](C:/HyperTwist/UnrealHyperTwist/Content/HyperTwistTraining/MaterializedCatalog/raw-extracts/posthog-posthog-control-plane-reference-pages.jsonl:1)

## Landed implementation scope

What landed:

- a first-party control-plane package ledger covering:
  - root `MIT` core versus `ee/` split
  - replay/session-recording surfaces
  - feature-flag governance surfaces
  - early-access rollout surfaces
- a first-party replay-diagnostic contract that records:
  - signal keys
  - verdict taxonomy
  - trigger and buffer semantics
  - timeline segmentation notes
  - replay warning categorization
- a first-party feature-governance contract that records:
  - rollout groups
  - multivariate variants
  - evaluation runtimes
  - blast-radius review posture
  - activity-log summary patterns
- a first-party scheduled-change contract that records:
  - supported change operations
  - recurrence modes
  - cron and date validation
  - patch-only update posture
- a first-party early-access rollout contract that records:
  - lifecycle stages
  - active-stage behavior
  - enrollment and rollout-to-all rules
  - internal lifecycle events
- a first-party compliance boundary that keeps `ee/` and the broader analytics shell excluded
- first-party runtime-library accessors and TSV checklist export for the new control-plane bundle
- bundled first-party reference targets and raw source-reference capture for replay diagnostics, replay segmentation, feature governance, scheduled changes, early-access lifecycle, and the `ee/` compliance boundary

What that means in practice:

- `PostHog/posthog` now owns the landed boundary-sensitive control-plane preserve lane in HyperTwist
- the landed surface is a first-party Unreal contract and runtime API, not a vague future donor note
- the practical path is bounded replay, feature-governance, and staged-release value extraction rather than product-analytics-shell inheritance
- the `ee/` subtree remains explicitly excluded from the landed lane

## Preserved landed value

The donor value that was actually promoted is:

- replay capture-failure diagnostics
- replay trigger, sampling, and buffer-state interpretation
- replay warning categorization and segmentation posture
- feature-flag rollout groups, variants, and evaluation-runtime semantics
- blast-radius review and activity-log summary posture
- scheduled future rollout, recurrence, and cron-validation rules
- early-access lifecycle and feature-enrollment transition rules
- explicit root-versus-`ee/` compliance boundaries

## Excluded or non-promotion boundary

Do not promote this packet into:

- the `ee/` subtree
- a blanket license to consume the entire PostHog monorepo
- product analytics ownership
- experimentation or warehouse platform ownership
- SaaS deployment or self-hosting architecture ownership
- generic whole-product shell adoption

Rationale:

- the retained value is concentrated in control-plane telemetry, replay-diagnostic, and rollout-governance patterns
- the right legal and architectural posture is a bounded first-party control-plane lane, not broad product adoption
- the `ee/` split must stay explicit because the root `MIT` license does not flatten enterprise paths into ordinary donor surfaces

## Acceptance markers satisfied

The `0R-C` and `Phase 1R` retained-value markers for this lane are now satisfied in first-party Unreal surfaces:

- a first-party replay-diagnostic contract exists
- a first-party feature-governance contract exists
- a first-party scheduled-change contract exists
- a first-party early-access rollout contract exists
- a first-party compliance boundary exists for `MIT` core versus `ee/`
- bundled first-party reference targets exist for replay diagnostics, segmentation, feature governance, scheduled changes, early-access lifecycle, and subtree compliance

## Validation

Validation completed for this packet:

- Unreal build succeeded with:
  - `C:\Program Files\Epic Games\UE_5.7\Engine\Build\BatchFiles\Build.bat UnrealHyperTwistEditor Win64 Development C:\HyperTwist\UnrealHyperTwist\UnrealHyperTwist.uproject -WaitMutex -NoHotReloadFromIDE`
- packet-bearing code compiled after the new `HyperTwistTrainingControlPlaneLibrary` and runtime accessors were added

Build result:

- `Succeeded` on `2026-05-13`

Packet-close validation completed before landing:

- `git diff --check`
- JSON validation for the updated materialized-catalog files and workspace manifest
- CSV import validation for the four canonical v6.3 ledgers
- final repo status check before commit

## Next move

The next bounded move is `Phase 4R-E`:

- widen `screenpipe/screenpipe` as the retained boundary-sensitive capture, history, replay, permission, and local-vault sidecar lane with `ee/` excluded
- keep the optional `Phase 3R-G` `pissang/claygl` and `pissang/clay-viewer` comparison lane deferred unless the landed browser spatial stack exposes a real gap
- keep `remotion-dev/remotion` behind the later commercially sensitive media-export sidecar decision after the more immediate replay-support lane is closed
