fix(docs): API documentation clarification + test reporting

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Summary

Clarifies HTTP API implementation status and adds test reporting infrastructure.

Changes

• Add `docs/api_status.md` documenting HTTP API implementations
• Add `tests/test_report.zig` for formatted test results
• Add `docs/research/TODO_TRIAGE_REPORT_20260326.md` triaging 277 TODO items
• Update README with version clarification (CLI v1.0.2 vs Research v5.2)
• Update CHANGELOG with corrections

Corrections

Original analysis incorrectly claimed HTTP API was "not implemented". Verified:

• `src/vibeec/http_server.zig` (1059 LOC) - OpenAI-compatible chat completions
• `src/trinity_node/http_api.zig` (1359 LOC) - DePIN node endpoints
• `src/api/unified_server.zig` (431 LOC) - Unified API registry

All HTTP servers are fully implemented and documented.

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

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API documentation exists: docs/api_reference.md + multiple API docs in docs/docs/api/ and docs/research/.