fix(qe-court): retire upstream panel self-heal

[pacphi]

Summary

• remove the temporary healJuryVendorCollision / healQeCourtPanel workaround and the ak sync mutation path now that qe-court's own shipped default config.json violates its writerIsNeverJuror invariant proffesor-for-testing/agentic-qe#576 is fixed in v3.13.3
• align the local read-only validator with upstream v3.13.3: config policy aliases bind, missing juries fail, metadata/provider-less seats are skipped, and validateCourtConfig applies the declared options
• keep ak status and host-provider status as read-only awareness; legacy invalid configs are reported with upgrade/manual guidance and never rewritten
• remove heal-only coverage, pin the corrected v3.13.3 shipped panel as valid, and verify status offers no heal for either valid or legacy-invalid configs
• document upstream ownership and the migration path for project configs created before v3.13.3

Issue #70 exit criteria

• upstream fix released in agentic-qe v3.13.3
• temporary qe-court helper and issue constant removed
• heal action and sync branch removed
• heal-only test file removed; read-only validation tests retained and updated
• exact corrected upstream routing passes its declared policy
• status reports the corrected config as healthy with no sync action

Verification

• pnpm run check
• pnpm run test:surface (25/25)

Closes #70.