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* fix(replay-e2e): match by conversation, not the living system prompt The model-replay match key hashed the full input including the lead-agent system prompt. That prompt is edited frequently (e.g. #3195 added a "File Editing Workflow" section), so the committed fixture went stale the moment the prompt changed on main — turning the Layer-2 render gate RED on every unrelated PR (#3430, #3432, ...). This was a self-inflicted false positive. Root-cause fix: - replay_provider._canonical_messages now EXCLUDES the system message from the hash. The conversation (human/ai/tool) is the stable contract that identifies a recorded turn; the system prompt is an internal detail not part of the front-back contract under test. (Mirrors how open-design keys its mock picker on the user prompt, not the system internals.) Proven robust: injecting a prompt edit no longer causes a replay miss. - Layer-1 golden was BLIND to replay misses: the gateway swallows a miss into an assistant error message, so the shape-only golden stayed green on a stale fixture. It now inspects replay_provider.replay_misses() and fails loud. (Layer-2 already fails on a miss.) - Re-recorded write_read_file.ultra fixture + regenerated golden under the new conversation-only hash. - Layer-2 render spec: assert the in-graph auto-title (deterministic); the follow-up suggestion is fired async and depends on a clean JSON model output, so assert it only when the fixture captured one — never gate on its absence (recording flakiness must not block CI). - docs: REPLAY_E2E.md updated. Verified: Layer-1 golden green (no miss), Layer-2 both specs green, CI=true make test 4033 passed / 0 failed, frontend pnpm check clean. * test(replay-e2e): restore suggestions coverage with a reliable capture Addresses review feedback (the suggestion path was dropped from Layer-2): - record spec now waits for the `/suggestions` response before checking capture stability, so the recorded fixture reliably includes the frontend-fired suggestions turn (previously the stability window could return before suggestions fired, yielding a fixture without it). - Re-recorded write_read_file.ultra: 5 turns (write_file, auto-title, read_file, answer, suggestions). Golden unchanged — suggestions is a separate /suggestions call, not part of the /runs/stream SSE sequence. - Layer-2 spec: restore the hard `EXPECTED_SUGGESTION` assertion. With the record spec now waiting for /suggestions, a fixture missing the suggestion turn means a broken recording and must fail loud, not pass silently. Verified: Layer-1 golden green (no miss), Layer-2 both specs green (auto-title + suggestion render), frontend pnpm check clean. * ci: re-trigger (flaky Docker Hub image pull in sandbox e2e, unrelated) backend-unit-tests failed only in test_sandbox_orphan_reconciliation_e2e.py with 'docker pull busybox:latest ... context deadline exceeded' — a CI-runner network flake reaching Docker Hub, not related to this docs/tests-only change. Empty commit to re-run CI. --------- Co-authored-by: DanielWalnut <45447813+hetaoBackend@users.noreply.github.com>