docs: add CLAUDE.md + provider example configs

- CLAUDE.md: project goals (advisory-only, real-bugs-not-nits, easy-to-enable,
  provider-agnostic, portable), architecture map, build/test/release, and
  maintenance rules — incl. "keep README + examples/ current with any env/flag/
  provider/trigger change" and the advisory-only invariant.
- examples/: local-ollama.yml, openai-compatible.yml, endpoint-aliases.yml +
  an examples/README index; README setup step points at them.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -36,8 +36,10 @@ or **Blocking issues found**.
 Gadfly ships as a container image, so consuming repos don't build anything — they just run
 it. Drop one file in your repo and set a couple of secrets/vars:
 
-1. Copy [`examples/adversarial-review.yml`](examples/adversarial-review.yml) to
-   `.gitea/workflows/adversarial-review.yml` in your repo.
+1. Copy a stub from [`examples/`](examples/) to `.gitea/workflows/adversarial-review.yml` in
+   your repo — [`adversarial-review.yml`](examples/adversarial-review.yml) for the Ollama Cloud
+   default, or a provider-specific one (local Ollama, OpenAI-compatible, endpoint aliases). See
+   the [examples index](examples/README.md).
 2. Add repo config:
    - **secret** `OLLAMA_CLOUD_API_KEY` — your [Ollama Cloud](https://ollama.com) key (empty
      ⇒ Gadfly posts a harmless "not configured" notice instead of reviewing). *Not needed if