docs(engine): document the deliberate gate-advisory twin divergence

[real-venus]

Summary

Records the converge-or-keep decision for the gate-decision advisory twin pair (#4881), and documents it clearly for future contributors — the issue's deliverable ("a clear, documented decision — converge or keep-divergent — for every twin pair in this area").

Decision: keep divergent. The pair src/rules/advisory.ts (host) ↔ packages/loopover-engine/src/advisory/gate-advisory.ts (engine) is the one explicitly documented as deliberately divergent, so the issue's boundary applies: "Don't converge the deliberately-divergent pair without first solving the dependency-graph-size problem it exists to avoid."

This PR adds a header comment to both twins explaining:

• Why they diverge: the host copy reaches into the full signals subsystem — isCodeFile (../signals/local-branch, which transitively pulls the whole review-scoring / GitHub-API graph), isTestPath, labelMatchesPattern (../scoring/preview), and the CollisionCluster/CollisionReport types from the ~5,800-line ../signals/engine. The engine copy is a slimmed re-implementation (slim predicted-gate-types + ../scoring/label-match, importing none of signals/engine), precisely so @loopover/engine — and the CLI packages that consume it (packages/loopover-miner, packages/loopover-mcp) — never drag signals/engine and its subsystem into their dependency graph.
• What keeps it safe: scripts/check-engine-parity.ts (GATE_DECISION_CORE_MARKERS) asserts both files still export the core gate-decision functions (evaluateGateCheck / evaluateGateCheckCore / isConfiguredGateBlocker / buildPullRequestAdvisory), so the gate decision stays in lock-step even as the surrounding types/plumbing diverge.
• The deferred alternative: converging into one shim must wait until the dependency-graph constraint is solved (e.g. a shared type-only module carrying CollisionReport without dragging the signals implementation along).

No gate-decision behavior changes — this is a comment-only diff (+26 lines of documentation, zero code changes), which directly satisfies the issue's hard acceptance criterion ("this is the one phase where 'no behavior change' needs to be actively verified"). The host-vs-engine advisory-parity suites still pass identically, and the engine-parity check still reports all pairs agree.

Note: this touches src/rules/advisory.ts (a guardrail path), so I expect the gate to hold it for maintainer review — which is appropriate, since the deliverable is a documented design decision.

Scope

• Conventional Commit title.
• Focused; no unrelated changes.
• Follows CONTRIBUTING.md; no site//CNAME/lovable.
• Linked a currently open issue — Closes Converge the scoring/rules twins #4881.

Validation

• git diff --check (comment-only; verified no non-comment line changed on either file)
• npm run typecheck (root + @loopover/engine build) clean
• Behavior unchanged: advisory-live-parity, live-gate-parity, gate-check-policy, advisory-ai-routing-call-sites all pass (136 tests) — the host and engine twins still produce identical gate decisions
• scripts/check-engine-parity.ts passes (20 pairs agree; core GATE_DECISION_CORE_MARKERS intact)
• npm run command-reference:check (unaffected)
• Rebased/verified against the latest main immediately before pushing — no base conflict

Codecov patch has no coverable lines to measure (the diff is entirely comments).

If any required check was skipped, explain why:

• actionlint, test:workers, ui:*, npm audit were not run — no workflow, worker, UI, or dependency surface changed. The full npm run test:ci runs them on CI.

Safety

• No secrets, wallet details, hotkeys, coldkeys, PATs, private keys, raw trust scores, private rankings, or private maintainer evidence exposed. Documentation only; behavior byte-for-byte unchanged.
• Public GitHub text stays sanitized and low-noise.
• No changelog edited.

Auth/CORS/session, API/OpenAPI/MCP, and UI safety boxes are not applicable.

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.06%. Comparing base (7d59907) to head (f32c832).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5784   +/-   ##
=======================================
  Coverage   95.06%   95.06%           
=======================================
  Files         580      580           
  Lines       46156    46156           
  Branches    14804    14804           
=======================================
  Hits        43880    43880           
  Misses       1516     1516           
  Partials      760      760           

Flag	Coverage Δ
shard-1	43.92% <ø> (-0.01%)	⬇️
shard-2	35.80% <ø> (+0.02%)	⬆️
shard-3	32.26% <ø> (+<0.01%)	⬆️
shard-4	33.56% <ø> (+0.61%)	⬆️
shard-5	31.20% <ø> (-0.55%)	⬇️
shard-6	44.59% <ø> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ages/loopover-engine/src/advisory/gate-advisory.ts	100.00% <ø> (ø)
src/rules/advisory.ts	97.77% <ø> (ø)

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✅ LoopOver review result - approve/merge recommended

_{Review updated: 2026-07-14 15:36:10 UTC}

2 files · 1 AI reviewer · no blockers · readiness 100/100 · CI green · clean

✅ Suggested Action - Approve/Merge

• safe to merge

Review summary
This is a pure comment-only documentation PR that adds header comments to both twins of the gate-decision advisory pair, recording a 'keep divergent' decision for issue #4881. No executable code changes — only comments prepended above existing imports in both files. The rationale is specific and verifiable against the diff itself (references to check-engine-parity.ts markers, the signals/engine dependency graph concern, and the consuming CLI packages).

Nits — 5 non-blocking

• The comments are quite long (18 and 8 lines) and duplicate much of the same explanation across both files; consider a shorter cross-reference in one file pointing to the fuller explanation in the other to reduce drift risk if the rationale changes.
• No test changes are needed here since this is comment-only, but confirm scripts/check-engine-parity.ts is not itself modified/tested as part of 'what keeps it safe' — the PR only documents reliance on it, doesn't change it.
• Consider linking directly to the issue number in a single canonical location (e.g., a doc file) rather than duplicating the full rationale in two source file headers, so future edits to the rationale only need to happen once.
• Nit: verify the parity script referenced (scripts/check-engine-parity.ts, GATE_DECISION_CORE_MARKERS) actually exists with that export name, since the review can't inspect it directly from the diff.
• Code changes lack test evidence — Add focused regression tests or explain why existing coverage is sufficient.

Signal	Result	Evidence
Code review	✅ No blockers	1 reviewer
Linked issue	✅ Linked	#4881
Related work	✅ No active overlap found	No same-issue or scoped active PR overlap found.
Change scope	✅ 20/20	Low review scope from cached public metadata (1 linked issue).
Validation posture	✅ 25/25	PR body includes validation/test evidence.
Contributor workload	✅ 10/10	Author activity: 106 registered-repo PR(s), 54 merged, 14 issue(s).
Contributor context	✅ Confirmed Gittensor contributor	real-venus; Gittensor profile; 106 PR(s), 14 issue(s).
Gate result	✅ Passing	No configured blocker found.
Improvement	⚠️ ℹ️ None detected	risk: low · value: none — No structural-improvement signals were detected for this PR. LLM value judgment: minor — The change is a low-risk, well-targeted documentation-only addition that closes a specific decision-recording deliverable from issue #4881 without altering any behavior.

Linked issue satisfaction

Partially addressed
The PR clearly satisfies the documentation deliverable for the one explicitly-divergent pair (advisory.ts / gate-advisory.ts), with good rationale and a parity-check safety net, and makes no gate-decision behavior changes. However, the issue asks for a decision documented for 'every twin pair in this area,' and this PR only addresses the single named pair rather than surveying and deciding on othe

Review context

• Author: real-venus
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository is configured for direct PR review.
• Public profile languages: TypeScript, JavaScript, Python, Rust, CSS, MDX, Svelte, Swift
• Official Gittensor activity: 106 PR(s), 14 issue(s).
• PR-specific overlap: none found.

Contributor next steps

• Keep the PR focused and include validation evidence before maintainer review.

Signal definitions

• Related work = same linked issue, overlapping active PRs, or title/path similarity.
• Change scope = cached public metadata such as size labels, draft state, and review-burden hints.
• Validation posture = whether the PR provides enough public validation/test evidence for maintainer review.
• Contributor workload = public contributor activity and cleanup pressure, not a repo-wide quality failure.
• Contributor context = public GitHub/Gittensor identity context; non-Gittensor status is not a blocker.

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_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed}

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Gittensory approves — the gate is satisfied and CI is green.