docs: reconcile examples/README + CLAUDE.md with the heavier reusable default

From PR #10's own review (maintainability/perf lenses): examples/README.md
hadn't been updated for the default swarm, and CLAUDE.md's 'keep the default
model count low' cost guidance read as contradicting the new heavy default.
Clarify that the IMAGE default stays minimal while the REUSABLE ships an
opinionated heavier default consumers inherit/override.

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

examples/README.md

@@ -6,7 +6,7 @@ set the secrets/vars it references. Gadfly is advisory only — it never blocks
 
 | File | Backend | Needs |
 |------|---------|-------|
-| [`reusable.yml`](reusable.yml) | **slimmest stub** — calls Gadfly's reusable workflow, forwarding only the secrets the reviewer needs (least privilege, not `secrets: inherit`); take the defaults or override a few inputs | secret `OLLAMA_CLOUD_API_KEY` |
+| [`reusable.yml`](reusable.yml) | **slimmest stub** — calls Gadfly's reusable workflow and inherits its **default swarm** (3 cloud + Claude Code, 5-lens suite), forwarding only the secrets it needs (least privilege, not `secrets: inherit`); the stub keeps a cloud-only `models:` override so it runs with just the Ollama key (drop it + add the Claude token to get the full default) | secret `OLLAMA_CLOUD_API_KEY` |
 | [`adversarial-review.yml`](adversarial-review.yml) | **Ollama Cloud** (default) + inline notes for every provider; full self-contained stub | secret `OLLAMA_CLOUD_API_KEY` |
 | [`local-ollama.yml`](local-ollama.yml) | a **local/LAN Ollama** daemon | nothing (or `GADFLY_BASE_URL` for a remote host) |
 | [`openai-compatible.yml`](openai-compatible.yml) | any **OpenAI-compatible** endpoint (local Ollama `/v1`, gateway, vLLM, OpenRouter…) | `GADFLY_BASE_URL` (+ a key for most gateways) |