AD-902: Implement Audit Log

[alph-cmky]

Source: docs/development/task-backlog.md

Milestone: Phase 9: Security and Audit

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AD-902: Implement Audit Log

Goal: Record task execution, patch proposals, approvals, and sensitive actions.

Files:

• Create apps/server/src/audit/audit-schema.ts
• Create apps/server/src/audit/audit-service.ts
• Create apps/server/src/audit/audit-service.test.ts

Tasks:

• Record who/what initiated each action.
• Record task ID, runtime ID, command summary, diff summary, approval decision, and timestamps.
• Redact secrets before persistence.
• Commit with message feat: add audit log service.

Acceptance Criteria:

• Audits can answer who changed what, when, through which agent/runtime, and with which approval.