Review live connection race handling

Implementation

Execute Output

status: complete

Implemented and committed all four units. The worktree is clean, and the final commit contains the required completion trailer.

Commits:

• f01312e987 — U1 lifecycle contract and deterministic regressions
• 95a7a87663 — U2 coordinated stream ownership
• 3e25d7d7c3 — U3 Async/Solid Cable/browser/stress evidence
• 5b6c37c131 — U4 documentation and completion trailer

Key changes include StatusChannel (link not exported), the reusable lifecycle contract (link not exported), channel regressions (link not exported), Solid Cable coverage (link not exported), browser coverage, test database wiring, and lifecycle/rollback documentation.

Verification:

• Focused channel: 24 tests, 135 assertions
• Solid Cable: 5 tests, 47 assertions
• Stress seed 42837: 100 iterations per race window; 25 tests, 1,935 assertions
• Focused browser: 30 tests, 222 assertions
• Full Web: 344 tests, 2,055 assertions
• Full system: 63 tests, 636 assertions
• RuboCop: clean
• Gemfile, lockfile, and cable.yml: unchanged
• Negative-control characterization exposed five pre-fix lifecycle failures

The golden-path test remained non-green in two attempts because its unchanged baseline fixture fakes Claude but mandatory plan review invokes a real Codex process beyond the test’s 90-second bound. This isolation gap is documented in wiki/gaps.md; no unrelated harness change was made.

implementation_engine_binding: null
requested_route: native
actual_route: native Codex
requested_model: null
actual_model: unverified
source_kind: plan
source_digest: b9243f07664c3fe608297201652fa5146a3e549a054443e13e29eef5eb828492
run_id: null
fallback_reason: null
plan_checkpoint: null
blockers: []
recovery_path: null
settled_decision_conflicts: []
behavior_change: true
standalone_shipping_skipped: true