release: v0.2.17 — open-source readiness + eval pattern examples + CV…

…E patches

Highlights:
- Open-source release-blocker set (#90, #91, #92, #93, #94) closed
- Eval pattern examples: 4 worked cases calling Azure OpenAI via new adapter
- Transitive-dep CVE patches: idna 3.13 -> 3.16, starlette 1.0.0 -> 1.1.0
- Admin-merge policy hardened in CONTRIBUTING.md
- README opener reframed around the human-LLM audience

Component PRs: #83, #99, #100, #101, #103, #104, #105, #106
Release PR: #108