feat(calibration): shared ORB+AMS signal-tracking module, with AMS wired live

[JSONbored]

Closes #7982.

Summary

• New packages/loopover-engine/src/calibration/signal-tracking.ts: a storage-agnostic RuleFiredEvent/HumanOverrideEvent + SignalStore interface, mirroring src/review/auto-tune.ts's own FlagStore-injection precedent, plus computeRulePrecision/computeRuleRepeatCount — the primitives Same-rule repeat alarm: fast-path detection when one deterministic rule rejects N distinct targets in a short window #7983 (same-rule repeat alarm) and Per-rule (not just per-project) precision tracking in the gate-eval pipeline #7984 (per-rule precision tracking) will build on directly. No behavior change to either consumer's existing decision logic — purely additive.
• Two adapters, each wrapping existing storage rather than a new table: ORB's src/review/signal-tracking-wire.ts over audit_events (new db/repositories.ts helper listAuditEventsByType, using the existing (event_type, created_at) index), and AMS's packages/loopover-miner/lib/signal-tracking-store.ts over the local event-ledger.ts.
• AMS is wired live, not deferred: discover-cli.ts's real (non---dry-run) run now records a rule-fired signal for every eligibility exclusion filterCandidatesByProfiles produces. This closes the exact gap the issue's own audit found — that filter was previously a 100% pure function with zero persistence, so there was no way to later ask how often an exclusion was actually right. Best-effort throughout (a store-open or write failure never aborts discovery); never recorded on a dry run (matches the dry-run path's own no-op portfolio-queue precedent).
• packages/loopover-miner/docs/ams-signal-tracking-design.md documents what's live vs. the one known, explicitly out-of-scope gap: AMS has no natural human-override trigger yet (excluding a candidate produces no AMS-authored artifact a human can act on, unlike reopening/reverting a PR for ORB) — flagged as a concrete follow-up issue, not a blocker for Same-rule repeat alarm: fast-path detection when one deterministic rule rejects N distinct targets in a short window #7983/Per-rule (not just per-project) precision tracking in the gate-eval pipeline #7984/Replace the blanket CONCRETE_EVIDENCE_BLOCKER_CODES breaker exemption with a per-rule track record #7986 (they can compute real reports off fired-only data; precision just reads null/undecided until an override path exists — computeRulePrecision's own contract already represents that correctly).
• Bonus fix: discovered a real test-isolation leak while wiring this — test/unit/miner-discover-cli.test.ts had no default-store redirect for the event ledger (unlike its existing portfolio-queue/policy-cache redirects), so its eligibility-filtering tests were writing real rows into the developer's own ~/.config/loopover-miner/event-ledger.sqlite3 on every run. Fixed with the same LOOPOVER_MINER_CONFIG_DIR redirect + closeDefaultEventLedger() reset pattern test/unit/miner-event-ledger.test.ts already established.

Test plan

• npm run typecheck, npm run build --workspace @loopover/engine, npm run build:mcp, npm run build:miner
• packages/loopover-engine's own npm test (node:test against dist/): 606/606 passing, including 9 new signal-tracking.test.ts cases
• New tests: test/unit/signal-tracking-wire.test.ts (ORB adapter, 16 cases, 100% line/branch on the new file), test/unit/miner-signal-tracking-store.test.ts (AMS adapter, 12 cases), test/unit/miner-discover-cli.test.ts additions (5 new cases covering the wiring: records on exclusion, no-op when nothing excluded, never records on dry-run, degrades on store-open failure, per-event write failures don't stop the rest)
• Verified (and fixed) the real-file leak: ls ~/.config/loopover-miner/event-ledger.sqlite3 confirmed absent after every full-suite run post-fix
• Full unsharded npm run test:coverage: 1091/1091 files, 20362 tests, 0 failures
• npm run engine-parity:drift-check: clean, no version bump needed (no gate-decision twin-pair file touched)

[superagent-security]

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

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	loopover-ui	f242dd1	Commit Preview URL Branch Preview URL	Jul 22 2026, 08:39 PM

[codecov]

Codecov Report

❌ Patch coverage is 82.60870% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.97%. Comparing base (1026fb3) to head (f242dd1).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...loopover-engine/src/calibration/signal-tracking.ts	0.00%	12 Missing ⚠️
...ckages/loopover-miner/lib/signal-tracking-store.ts	90.00%	0 Missing and 3 partials ⚠️
packages/loopover-miner/lib/discover-cli.ts	91.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8079      +/-   ##
==========================================
- Coverage   91.98%   91.97%   -0.02%     
==========================================
  Files         748      751       +3     
  Lines       76617    76709      +92     
  Branches    23239    23268      +29     
==========================================
+ Hits        70474    70550      +76     
- Misses       5041     5053      +12     
- Partials     1102     1106       +4     

Flag	Coverage Δ
shard-1	54.95% <70.65%> (+1.47%)	⬆️
shard-2	54.16% <0.00%> (-1.42%)	⬇️
shard-3	53.98% <20.65%> (-0.55%)	⬇️

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

Files with missing lines	Coverage Δ
src/db/repositories.ts	96.73% <100.00%> (+0.01%)	⬆️
src/review/signal-tracking-wire.ts	100.00% <100.00%> (ø)
packages/loopover-miner/lib/discover-cli.ts	99.51% <91.66%> (-0.49%)	⬇️
...ckages/loopover-miner/lib/signal-tracking-store.ts	90.00% <90.00%> (ø)
...loopover-engine/src/calibration/signal-tracking.ts	0.00% <0.00%> (ø)