Add self-healing locator write-back (learned-locator store)

[JE-Chen]

Self-healing/meta batch (from multi-agent web research; verified absent — the top net-new gap). Full layers + tests + EN/Zh v54 docs + README.

Feature (utils/locator_repair, pure-stdlib via json_store)

• RepairStore closes the heal→durable-fix loop: runtime self-healing previously threw away the corrected location (heals were logged but never persisted), so every run re-healed. record captures the corrected locator (coords/VLM description/method) and auto-applies it when confidence >= auto_threshold (default 0.9), else queues a pending suggestion; approve/reject gate queued ones; resolved(key) returns the latest applied/approved fix for reuse. repair_from_heal adapts a HealEvent (object or dict).
• Executor AC_repair_record / AC_repair_resolved / AC_repair_pending / AC_repair_approve; MCP ac_repair_*; Builder under Tools.

Verification

• 10 tests pass (high-conf auto-apply, low-conf queue, approve→resolvable, reject, latest-wins, from-heal object+dict, cross-instance persistence, executor round-trip, wiring, facade); ruff clean; radon no CC≥C; bandit clean; PySide6-free.
• Stacked on decision table (Add DMN-style decision tables #261); rebased cleanly onto dev.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 46 complexity · 0 duplication

Metric	Results
Complexity	46
Duplication	0

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud