feat(agent): dedupe near-duplicate crops before the SigLIP embed

Figure boxes are already NMS-merged (iou 0.6) and each YOLO detector self-NMSes,
but the combined per-frame crop pile (figure→concept ∪ anatomy component→concept
∪ panel) was embedded with no cross-proposer dedup — so genuine near-duplicates
slipped through (a figure box ≈ an anatomy component on a solo bust; overlapping
booru head classes on one head), embedding the same region twice and burning a
slot against max_regions.

Add detectors.dedupe_crops(): a greedy, high-IoU (default 0.85), kind-aware pass
over the pending (crop, template) list right before embed_batch — drop boxes that
overlap ≥ iou within the same kind, keep the highest score. The high threshold is
deliberate: it collapses only true near-identical boxes while preserving
intentional nested crops across scopes (a whole figure vs a small head component
sit well below it) and distinct kinds (concept vs panel). Env-tunable DEDUPE_IOU
(≥1.0 disables). Runs on CPU before the GPU work, so it cuts both embed cost and
region count. Temporal (cross-frame) dedup deferred. Build marker 2026-07-01.2.

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

agent/fc_agent/worker.py

@@ -40,6 +40,7 @@ from . import media, models
 from .client import FcClient
 from .config import Config
 from .crops import crop_region
+from .detectors import dedupe_crops
 
 # Cap on the lease-retry backoff: when curator is unreachable (e.g. you redeploy
 # it while away), a downloader retries leasing with exponential backoff up to this
@@ -629,6 +630,12 @@ class Worker:
                             "score": score, "detector_version": "panel",
                         }))
                 if pending:
+                    # Drop near-duplicate crops (a figure box ≈ an anatomy
+                    # component, overlapping booru classes) before the embed so we
+                    # never SigLIP the same region twice — saves GPU and a slot
+                    # against max_regions. High-IoU + kind-aware, so intentional
+                    # nested crops (figure ⊃ head) survive.
+                    pending = dedupe_crops(pending, self.cfg.dedupe_iou)
                     vecs = embedder.embed_batch([c for c, _ in pending])
                     for (_c, tmpl), vec in zip(pending, vecs, strict=True):
                         tmpl["siglip_embedding"] = vec