enforce word count in chapter_polish and book_chapter templates

- chapter_polish: add explicit 'chapter_target_words minimum' warning to think hint
  with instruction to EXPAND scenes to reach target length
- chapter_polish: add word_count criterion (30%) to adjudication, restructure weights
- book_chapter PASS 1: strengthen word count instruction with explicit stop-early warning
- book_chapter: add word_count criterion (30%) to adjudication, restructure weights

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

templates/book_chapter.yml

@@ -95,7 +95,10 @@ steps:
         - Every scene beat moves the story forward OR reveals character (no filler)
         - End with the CLOSING HOOK you planned
         - Match the prose style guide: {prose_style}
-        - Target length: {chapter_target_words} words — write the full chapter, not a summary
+        - Target length: {chapter_target_words} words — write the FULL chapter, not a summary
+        - ⚠️ DO NOT stop early. If you have not reached {chapter_target_words} words, continue
+          writing — add interiority, sensory detail, extended dialogue beats, and scene transitions
+          until you hit the target. Short chapters will be REJECTED in adjudication.
 
       Output ONLY the polished chapter text.
       Start directly with the chapter title (e.g., "Chapter N: [Title]") and opening line.
@@ -176,15 +179,18 @@ adjudication:
   pass_threshold: 80
   deliverable_type: consumer
   criteria:
-    narrative_flow:
+    word_count:
       weight: 30
+      description: "Chapter meets the {chapter_target_words}-word minimum; under-length chapters fail"
+    narrative_flow:
+      weight: 25
       description: "Story progresses naturally with good pacing"
     character_voice:
-      weight: 25
+      weight: 20
       description: "Characters are distinct and consistent"
     prose_quality:
-      weight: 25
+      weight: 15
       description: "Writing is polished and engaging"
     continuity:
-      weight: 20
+      weight: 10
       description: "Consistent with prior chapters and canon"