Improve topless/bottomless definitions to prevent confusion

Enhanced clothing state definitions with:
- Explicit upper/lower body language
- Concrete examples (shirt and pants, bare chest, etc.)
- Clear contrast between topless and bottomless
- Added system prompt rule emphasizing the distinction

Before: "upper body is uncovered but lower body has clothing"
After: "NO shirt/top (bare chest), BUT wearing pants/bottoms"

Addresses diagnostic test failure where LLM confused bottomless
with topless on "wearing only a hoodie on upper body" caption.

https://claude.ai/code/session_015ZwE7a5E6YVTrMpuB2pXX7

psq_rag/llm/select.py

@@ -874,13 +874,16 @@ def _load_structural_groups() -> List[StructuralGroup]:
         constraint="multi",
         tags=[
             ("clothed", _def("clothed",
-                "A character is wearing clothes on both upper and lower body")),
+                "Wearing clothes on BOTH chest/torso AND legs/waist. "
+                "Examples: shirt and pants, dress, full outfit")),
             ("nude", _def("nude",
-                "A character is wearing no clothes at all")),
+                "Wearing NO clothes at all. Completely naked, no shirt and no pants")),
             ("topless", _def("topless",
-                "A character's upper body is uncovered but lower body has clothing")),
+                "NO shirt/top (bare chest), BUT wearing pants/bottoms. "
+                "Upper body exposed, lower body covered")),
             ("bottomless", _def("bottomless",
-                "A character wears clothing on upper body but lower body is uncovered")),
+                "Wearing shirt/top on chest, BUT NO pants/bottoms. "
+                "Upper body covered, lower body exposed")),
         ],
     ))
 
@@ -933,7 +936,8 @@ IMPORTANT RULES:
 2. Do NOT guess or assume things the description does not mention.
 3. For body type: "anthro" means an ANIMAL with a human-shaped body (walks upright, has hands, but still has fur/tail/muzzle). "humanoid" means HUMAN or human-like with NO animal features. A wolf standing on two legs = anthro, NOT humanoid.
 4. If the description never mentions gender, pick "gender cannot be determined".
-5. If clothing is not mentioned, do NOT pick any clothing statement.
+5. For clothing state: READ CAREFULLY! "topless" = bare chest, wearing pants. "bottomless" = wearing shirt, no pants. If unsure, re-read the description.
+6. If clothing is not mentioned, do NOT pick any clothing statement.
 
 Return JSON ONLY:
 {{"selections": [{{"i": 1}}, {{"i": 5}}]}}