Trey t bb7493f033 Close all 25 codex audit findings and add KMP contract tests ...

Remediate all P0-S priority findings from cross-platform architecture audit:
- Add input validation and authorization checks across handlers
- Harden social auth (Apple/Google) token validation
- Add document ownership verification and file type validation
- Add rate limiting config and CORS origin restrictions
- Add subscription tier enforcement in handlers
- Add OpenAPI 3.0.3 spec (81 schemas, 104 operations)
- Add URL-level contract test (KMP API routes match spec paths)
- Add model-level contract test (65 schemas, 464 fields validated)
- Add CI workflow for backend tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-18 13:15:07 -06:00

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