feat(reusable): ship the curated swarm as the default config consumers inherit

Make the reusable workflow's input defaults BE the standard Gadfly swarm so a
consumer subscribes by just calling it (no `with:` block) and inherits:
- models: 3 strong cloud (minimax-m3, glm-5.2, deepseek-v4-pro) + Claude Code
  (sonnet, opus, opus:max)
- specialists: the 5-lens default suite (security, correctness, maintainability,
  performance, error-handling)
- provider_concurrency: ollama-cloud=3,claude-code=3 (all three claudes at once)
- timeout_minutes default 45 -> 90 (5 lenses x 2 passes over a slow lane)

The default is opinionated (needs OLLAMA_CLOUD_API_KEY + CLAUDE_CODE_OAUTH_TOKEN);
consumers override `models:` for cloud-only / other providers. gadfly's own
caller is slimmed to inherit (only allowed_users remains). examples/reusable.yml
keeps a cloud-only `models:` override so a public copy works with just the
Ollama key. README/CLAUDE.md updated.

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

README.md

@@ -39,7 +39,8 @@ it. Drop one file in your repo and set a couple of secrets/vars:
 1. Copy a stub from [`examples/`](examples/) to `.gitea/workflows/adversarial-review.yml` in
    your repo. Two flavors: the slim [`reusable.yml`](examples/reusable.yml) — a tiny caller of
    Gadfly's **reusable workflow** (`uses: steve/gadfly/.gitea/workflows/review-reusable.yml@…`,
-   forwarding only the secrets the reviewer needs), best when you take the defaults — or the full self-contained
+   forwarding only the secrets the reviewer needs), which ships a **default swarm** (3 cloud models +
+   the Claude Code engine, 5-lens suite) you inherit by omitting `with:` or override per-input — or the full self-contained
    [`adversarial-review.yml`](examples/adversarial-review.yml) (Ollama Cloud default, with inline
    notes for every provider / local Ollama / OpenAI-compatible / endpoint aliases). See the
    [examples index](examples/README.md).