feat(agent): crop proposers — booru_yolo anatomy + COCO person + comic panels (#1202)

Better region PROPOSERS feeding the existing crop→SigLIP→max-over-bag heads (no
change to the learned-tagging approach; no per-tag cost — propose once, embed
each region, all heads in one matmul).

- detectors.py: lazy ultralytics YOLO wrapper, each proposer independently
  optional + guarded (a bad weight spec / inference error self-disables that one,
  logged, never breaks the worker). Weights resolve from an ultralytics name |
  http(s) URL | "hf_repo::file", cached under HF_HOME. NMS merge so a figure two
  detectors both find collapses to one crop.
- worker: figure boxes = imgutils detect_person ∪ general COCO person (merged)
  → CCIP + concept (anime + Western/realistic coverage); booru_yolo anatomy
  components (head/cat-head/anatomy/…) → concept crops; comic panels → kind=
  'panel' concept crops. Capped per frame (MAX_COMPONENTS/MAX_PANELS).
- config + compose: PERSON_WEIGHTS (default yolo11n.pt, works OOB),
  ANATOMY_WEIGHTS + PANEL_WEIGHTS (operator sets booru_yolo URL + mosesb panel
  hf::file; empty = off). ultralytics added to requirements.
- backend: image_region 'kind' doc notes 'panel'; no migration (free String,
  and the bag scorer keys on a non-null siglip_embedding, not the kind, so any
  SigLIP region joins the bag automatically).

Agent is outside CI — py-compiled here; operator tests on the GPU and checks
Western-vs-anime crop quality via /api/ccip observability.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ttrj5P7upUTueSfoJcxEqa

agent/fc_agent/config.py

@@ -18,6 +18,16 @@ class Config:
     #                            the server announces in the lease)
     auto_start: bool     # start the worker pool on boot (so a container restart
     #                      resumes processing without anyone clicking Start)
+    # Crop PROPOSERS (extra YOLO detectors that say where to crop). Each weight
+    # spec is an ultralytics name | http(s) URL | "hf_repo::file" ("" = off).
+    person_weights: str  # general COCO person detector (Western/realistic figs)
+    person_conf: float
+    anatomy_weights: str  # booru_yolo anime/furry/NSFW components
+    anatomy_conf: float
+    panel_weights: str    # comic-panel detector
+    panel_conf: float
+    max_components: int   # cap anatomy component crops per frame
+    max_panels: int       # cap panel crops per frame
 
     @classmethod
     def from_env(cls) -> "Config":
@@ -33,4 +43,12 @@ class Config:
             embed_dtype=os.environ.get("SIGLIP_DTYPE", "float16"),
             embed_model_override=os.environ.get("EMBED_MODEL_NAME", ""),
             auto_start=os.environ.get("AUTO_START", "").lower() in ("1", "true", "yes"),
+            person_weights=os.environ.get("PERSON_WEIGHTS", "yolo11n.pt"),
+            person_conf=float(os.environ.get("PERSON_CONF", "0.35")),
+            anatomy_weights=os.environ.get("ANATOMY_WEIGHTS", ""),
+            anatomy_conf=float(os.environ.get("ANATOMY_CONF", "0.30")),
+            panel_weights=os.environ.get("PANEL_WEIGHTS", ""),
+            panel_conf=float(os.environ.get("PANEL_CONF", "0.30")),
+            max_components=int(os.environ.get("MAX_COMPONENTS", "8")),
+            max_panels=int(os.environ.get("MAX_PANELS", "8")),
         )