P9-S38: launch and release docs

[samrusani]

Summary

• polish the public README, quickstart, integrations, and release docs for the shipped Phase 9 wedge
• add repo-readiness files and release assets for the first public v0.1 cut
• align launch claims and eval gating commands to shipped evidence only

Validation

• docker compose up -d
• ./scripts/migrate.sh
• ./scripts/load_sample_data.sh
• APP_RELOAD=false ./scripts/api_dev.sh
• curl -sS http://127.0.0.1:8000/healthz
• ./.venv/bin/python -m pytest tests/unit tests/integration
• pnpm --dir apps/web test
• ./scripts/run_phase9_eval.sh --report-path eval/reports/phase9_eval_latest.json
• ./scripts/run_phase9_eval.sh --user-id 00000000-0000-0000-0000-000000000938 --user-email phase9-eval-938@example.com --display-name "Phase9 Eval 938" --report-path eval/reports/phase9_eval_latest.json
• ./.venv/bin/python scripts/check_control_doc_truth.py
• internal markdown link existence check across new P9-S38 docs