feat(reusable): add the 4090 Ti (qwen3.6-27b via llama-swap) to the default swarm

Adds a local GPU reviewer to the shared default:
- models += ragnaros/qwen3.6-27b
- GADFLY_ENDPOINT_RAGNAROS=llama-swaps|https://llama-swap.ragnaros.dudenhoeffer.casa
  (plain LAN URL, no credential; registers provider "ragnaros")
- provider_concurrency ragnaros=1, provider_lens_concurrency ragnaros=1
  (one model, one lens at a time — a single local GPU)

Inherited by all @v1 consumers (mort/executus/majordomo) once v1 moves.
Comments + README + CLAUDE.md updated.

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

CLAUDE.md

@@ -47,8 +47,9 @@ 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;
-                       3 claude models concurrent, 5 lenses each) so consumers inherit it by omitting `with:`. Consumers subscribe
+                       input defaults (3 cloud + Claude Code sonnet/opus/opus:max + a local 4090 Ti
+                       via llama-swap, 5-lens suite; 3 claude models concurrent / 5 lenses each, the
+                       4090 Ti 1 model × 1 lens) 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