feat(platform): add phase8 100k production readiness gates #65

Job	Run time
Python (ruff · mypy · pytest)	34s
Rust (fmt · clippy · test)	3m 52s
OpenAPI spec validation (§5)	50s
Security · SAST · SBOM	23s
Frontend (lint · typecheck · test · build)	54s
License compliance (§3)	3m 36s
	10m 9s

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