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>

.claude/agents/hermes-curator.md

@@ -76,6 +76,24 @@ profiles:
    Authorization: Bearer $PAPERCLIP_API_KEY
    { "body": "<my findings>" }
    ```
+5b. **רושם כל ממצא גם ב-API של legal-ai כ-decision_lesson**, כך שיופיע ב-UI
+    תחת הטאב "מה למדנו" של ההחלטה בקורפוס. דרישה: למצוא קודם את ה-`style_corpus_id`
+    שתואם ל-`decision_number` של ההחלטה (`GET /api/training/corpus` ולסנן).
+    לכל ממצא:
+    ```
+    POST https://legal-ai.nautilus.marcusgroup.org/api/training/corpus/{corpus_id}/lessons
+    Content-Type: application/json
+    {
+      "lesson_text": "<התקציר של הממצא — מה ראיתי + הצעה — שורה אחת>",
+      "category": "<style|structure|lexicon|tabular|general>",
+      "source": "curator"
+    }
+    ```
+    מיפוי תגי-ממצא ל-`category`:
+    - `[סגנון]` → `style`
+    - `[מבנה]` → `structure`
+    - `[לקסיקון משפטי]` → `lexicon`
+    - `[טבלאי]` → `tabular`
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