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>

CLAUDE.md

@@ -100,7 +100,10 @@ comment with a section each. Default suite = security/correctness/maintainabilit
 error-handling; opt-in built-ins = tests/docs/conventions/improvements. Select via
 `GADFLY_SPECIALISTS` (csv or `all`); define/override via `GADFLY_SPECIALIST_<NAME>` env or a repo
 `.gadfly.yml` (`specialists:` + `define:`). See `cmd/gadfly/specialists.go`. Cost ≈
-specialists × models × 2 passes — keep the default model count low (entrypoint defaults to one).
+specialists × models × 2 passes — the **image/entrypoint** default stays minimal (one model) for
+that reason; the **reusable workflow** (`review-reusable.yml`) deliberately ships a heavier
+opinionated default swarm (3 cloud + Claude Code, 5 lenses) for steve's own fleet, which consumers
+inherit or override per-input.
 **Dynamic `auto`** (`GADFLY_SPECIALISTS=auto`): a selector (`GADFLY_SELECTOR_MODEL` or the review
 model) picks lenses per-diff and may invent ad-hoc ones (`cmd/gadfly/auto.go`). **Worker-tier**
 (`GADFLY_WORKER_MODEL`): a `delegate_investigation` tool offloads grep/read legwork to a cheap