feat(training): Style Studio — upload, rich corpus, lessons, curator portrait, chat

Six-phase upgrade of /training from a read-only dashboard into a full
Style Studio for managing Daphna's style corpus.

- Upload Sheet on /training: file → proofread preview → commit (no more
  CLI-only `upload-training` skill).
- Rich corpus metadata: GET /api/training/corpus returns summary, outcome,
  key_principles, page_count, parties (regex), legal_citation, lessons_count.
  PATCH endpoint for chair edits. CorpusDetailDrawer with 4 tabs (details
  /content/lessons/patterns) replaces the bare table row.
- LLM metadata enrichment: style_metadata_extractor + MCP tools
  (style_corpus_enrich, style_corpus_pending_enrichment) fill summary
  /outcome/key_principles via claude_session (free, host-side).
- Per-decision lessons: new decision_lessons table + 4 REST endpoints +
  LessonsTab in drawer; hermes-curator now auto-posts findings as
  decision_lessons(source=curator).
- Curator Portrait tab: prompt rendered with link to Gitea, recent
  curator findings, style_analyzer training prompts, propose-change
  form that writes proposals to data/curator-proposals/ for manual
  chair review (no auto-mutation of the agent file).
- Style chat tab: SSE-streamed conversations with the style agent.
  New host-side pm2 service (legal-chat-service, port 8770) wraps
  claude CLI with stream-json + --resume continuation; FastAPI proxies
  via host.docker.internal. Zero API cost — uses chaim's claude.ai
  subscription. chat_conversations + chat_messages persist history.

Architecture: keeps the existing rule that claude_session only runs
on the host (not the container). The new legal-chat-service is the
canonical bridge between the container and the local CLI for the chat
feature; everything else (upload, metadata, lessons) stays within the
container's existing capabilities.

Audit script (scripts/audit_training_corpus.py) included for verifying
which corpus rows still need enrichment.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

mcp-server/src/legal_mcp/server.py

@@ -57,6 +57,7 @@ from legal_mcp.tools import (  # noqa: E402
     legal_arguments as la_tools,
     missing_precedents as mp_tools,
     citations as cit_tools,
+    training_enrichment as train_tools,
 )
 
 
@@ -248,6 +249,18 @@ async def precedent_extract_metadata(case_law_id: str) -> str:
     return await plib.precedent_extract_metadata(case_law_id)
 
 
+@mcp.tool()
+async def style_corpus_enrich(corpus_id: str, overwrite: bool = False) -> str:
+    """חילוץ מטא-דאטה (summary, outcome, key_principles, appeal_subtype) להחלטה בקורפוס הסגנון של דפנה. ברירת מחדל: ממלא רק שדות ריקים. שלח `overwrite=true` כדי לרענן."""
+    return await train_tools.extract_decision_metadata(corpus_id, overwrite=overwrite)
+
+
+@mcp.tool()
+async def style_corpus_pending_enrichment(limit: int = 50) -> str:
+    """רשימת החלטות בקורפוס הסגנון שעדיין חסרות summary/outcome/key_principles — מועמדות לחילוץ."""
+    return await train_tools.list_corpus_pending_enrichment(limit)
+
+
 @mcp.tool()
 async def precedent_process_pending(kind: str = "metadata", limit: int = 20) -> str:
     """ריקון תור בקשות חילוץ שנשלחו מ-UI. kind: 'metadata' או 'halacha'. מריץ extractor מקומית עם CLI על כל פריט בתור, ומנקה את הסימון אחרי הצלחה."""