## Summary
Adds the run-backed API surface needed for a real Ask Fabro sidebar: run
readiness metadata, detailed session projections, session-scoped event
listing/attach streaming, and turn control that exposes durable turn IDs
and machine-readable failures.
## What Changed
- Extended the OpenAPI contract and regenerated Rust/TypeScript clients
for `Run.ask_fabro`, `SessionDetail`, `SessionTurn`, paginated run
sessions, session event APIs, and optional client-supplied `turn_id`
values.
- Updated `fabro-types` and `fabro-store` so durable `run.session.*`
events project active turn state, transcript messages, and the latest
owning run event sequence.
- Implemented server routing for session details, `/events`, `/attach`,
turn conflict headers, typed turn failure codes, and cheap run readiness
decoration across run responses.
- Added browser helpers for POST turn streaming and session attach SSE
parsing, plus an exported generated `sessionsApi`.
## Verification
- `cargo +nightly-2026-04-14 fmt --check --all`
- `cargo +nightly-2026-04-14 clippy --workspace --all-targets -- -D
warnings`
- `cargo build --workspace`
- `cargo test -p fabro-types
run_session_turn_failed_defaults_code_for_old_events`
- `cargo test -p fabro-store run_sessions::tests`
- `cargo test -p fabro-api`
- `cargo test -p fabro-server --features test-support --test it
api::sessions`
- `cargo test -p fabro-server --features test-support --test it
api::runs`
- `cd apps/fabro-web && bun test app/lib/session-stream.test.ts`
- `cd apps/fabro-web && bun run typecheck`
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