Enforcement-result emission to world model

[CodeBuildder]

Context

Enforcement actions (block/audit/mutate) recorded in world model as action events. Parent: #81.

Acceptance Criteria

• Each enforcement result written to world model as action event
• Action event includes: action_type=policy-enforce, outcome (blocked|mutated|allowed), entity_id
• World model security_posture for the entity updated based on enforcement outcome
• Integration test: trigger policy block → action event in world model with correct outcome

Dependencies

Blocked by: none | Blocks: none

Notes

No model tier.