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feat(aqua): unlock normalized KB identity via env with plant fallback
- normalized_release EXPECTED_RELEASE defaults to NORMALIZED_RELEASE_ID (plant value)
- from_env falls back to constant on empty env; backend_guard uses env-or-constant
- start.sh sources env/active_library.env after prod.env (qa + legacy-rag)
- build_all.sh --library <name|dir> renders library identity (no name whitelist)
- add kb-libraries skeleton (plant/aqua identity cards) and tooling/aqua_kb
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>