Expose verified legacy Action correlation readback

[pcvantol]

Scope

Implements registered LANE_3 r5 assignment L3-FORGE-SERIAL-CORRELATION-COMPAT-V1-20261001 in #207. Authenticated installed Mission detail now exposes a versioned read-only compatibility view of the already persisted legacy singleton execution correlation. It binds only when the direct or request-nested Mission/Action/correlation identity matches one unambiguous stored Action. Missing, malformed, contradictory or multi-active context reports UNAVAILABLE/UNSUPPORTED without selecting a child.

The projection exposes only Action ID/status, correlation ID, optional host run ID and Mission revision. It omits prompt/credential-bearing request fields, performs no migration or write, and grants no EP admission, target, dispatch or Mission lifecycle authority. Full PA-F1 migration and multi-slot execution remain open.

Validation

• bash scripts/validate.sh: 1,063 Forge tests passed; one existing skip; product version and offline projection checks passed.
• Exact-head full coverage run: 1,063 tests passed; changed production files 84% (operations read API) and 98% (serial correlation projection), each above 80.2%.
• Independent exact-head Quality and Security reviews passed after the missing-Mission-ID correction. CI/static validation, CodeQL and product-version checks passed; protected merge and non-editable installed merge-wheel HTTP readback completed. Terminal evidence is in [LANE_3 / Forge] Four-product lane register and roadmap transition #207.

Assignment register: #207.