fix(e2e): #362 — reclassify Flow 3 'no cc rows + no verdicts' as advisory

[silongtan]

Summary

Closes #362. Makes the Flow 3 no compliance_check rows + no verdicts branch an advisory failure (matching Flow 2a/4/4b in the same agentic layer) so the agentic-layer gap stays visible without blocking unrelated PRs.

This unblocks #354, #356, #360, #361, and any future PR hit by the same agent-variance issue.

Investigation summary

Documented in detail on #362. Short version: this is downstream agent variance, not a server regression.

Run	Flow 5 bicameral calls	Flow 3 outcome
Passing (devin/1778808036)	history → resolve_compliance → ratify → history	cc_delta=10, 7 verdicts written, PASS
Failing (PR #354)	dashboard → history → ratify	cc_delta=0, verdicts=0, FAIL (blocking)
Failing (PR #360)	history → ratify → history	cc_delta=0, verdicts=0, FAIL (blocking)

In every failing run the _sync_guidance field on the history response explicitly instructed "call bicameral.resolve_compliance". The agent in those runs ignored the instruction. Querying each failing-run ledger.db artifact confirmed PR #351's prune logic did not prune any decision — all 3 decisions in PR #360's run had signoff states {proposed, proposed, ratified}, no pruned state anywhere. This rules out the prime "regression at 02:50 UTC" suspect.

Why the prompt can't be tightened instead

Per DEV_CYCLE.md:

"Use natural prompts — never name the tool the agent is supposed to auto-fire. Naming the tool defeats the trigger that IS the product."

So the fix-by-tightening-Flow-5-prompt path is closed by design. Either we make Flow 3 advisory (this PR), or we accept the strict-blocking assertion will flake on agent variance — which is exactly what's happening right now to PR #354, #356, #360, #361.

Why this is consistent with the existing model

The e2e report already declares the agentic layer unvalidated:

"The end-to-end correction dynamic ('dev contradicts spec → preflight catches → refinement captured → PM ratifies') is NOT validated by this headless harness. MCP tool surface is callable and functional; agentic auto-fire is the open gap. Validate the agentic layer via the interactive recording path."

Flow 2a/4/4b are all in the agentic layer and all advisory. Flow 3 was the asymmetric outlier — strict-blocking despite the same class of failure mode. This PR removes the asymmetry.

Diff

One file, two changes:

1. Flow 3 FAIL branch (tests/e2e/run_e2e_flows.py:438-477): flow3.advisory now set to non-empty text. The CI gate filter at line 1608 (verdict in ("FAIL","ERROR") AND NOT advisory) excludes it from blocking_failures. Overall workflow exit code = 0 when Flow 3 is the only red flow.
2. Verdict-matrix docstring at line 320 updated to reflect the new non-blocking semantics. References Regression: v0 user flow e2e Flow 3 (commit-sync → compliance_check) — 0 verdicts written, all dev-targeting PRs blocked #362.

Test plan

• CI green on this PR (this PR DOESN'T modify any path the v0-user-flow-e2e workflow watches, so the workflow won't even fire — see paths: in the workflow YAML)
• After merge: PR ci(perf): #357 sub-task 2 — file-backed SurrealKV perf gate #360 and infra(pre-commit): #357 sub-task 3 — local ruff enforcement at commit time #361 unblock (re-run their e2e and confirm Flow 3 FAIL → advisory, overall PASS)
• Validate Flow 2a/4/4b remain advisory (unchanged)
• Validate the prior Flow 3 PASS paths (full verdicts, headless-terminus cc rows) remain PASS (unchanged code path)

Out of scope

• The underlying agent variance. Same class of issue as [P0] Preflight skill does not instruct agent to capture refinements when user prompt contradicts surfaced decisions #154 / [P1] SessionEnd capture-corrections hook is silently broken — design pivot to next-session surfacing #156. Real fix is in the agentic auto-fire layer (skill instructions, system reminders, or hook design) — not the e2e harness.
• A real git-bisect over the 3 commits in the breakage window. Still worth doing if anyone has reason to think the agent variance is being amplified server-side, but the evidence above (prune logic didn't fire, no other PR touched the relevant pipeline) points to plain agent non-determinism.

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