tune(reusable): claude-code=1 model x 5 lenses (cap peak at 5 concurrent)

Run claude models one at a time (provider_concurrency claude-code=1) but each
with all 5 lenses concurrent (provider_lens_concurrency claude-code=5) — peak 5
concurrent claude -p per pass instead of 15, friendlier to one subscription.
Updated all the 'three claudes at once' wording across the workflow + docs.

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

CLAUDE.md

@@ -47,8 +47,8 @@ entrypoint.sh          container brains: trigger gating, PR clone, model loop (t
 Dockerfile             multi-stage; private-module creds via BuildKit secrets never reach the final image
 .gitea/workflows/build-image.yml   push main → :latest; tag v* → :<tag>+:latest; PR → build-only
 .gitea/workflows/review-reusable.yml  reusable (workflow_call) review job; ships the DEFAULT swarm as
-                       input defaults (3 cloud + Claude Code sonnet/opus/opus:max, 5-lens suite,
-                       claude-code=3) so consumers inherit it by omitting `with:`. Consumers subscribe
+                       input defaults (3 cloud + Claude Code sonnet/opus/opus:max, 5-lens suite;
+                       claude models serial, 5 lenses each) so consumers inherit it by omitting `with:`. Consumers subscribe
                        with an ~8-line caller forwarding only the secrets the reviewer needs (Phase 4);
                        gadfly's own adversarial-review.yml is a thin caller of it (dogfoods the path).
 examples/              copy-paste consumer stub workflows for different providers