Add auto-heal pipeline command and fix multi-source draft processing

- Add `ietf auto` command: fetches, analyzes, embeds, extracts ideas,
  and refreshes gaps across all sources with cost-based auto-approval
- Fix SourceDocument→Draft conversion in auto fetch step
- Fix gap_analysis method name in auto command
- Process all 270 unrated ETSI/ISO/ITU/NIST drafts (761 total, all rated)
- Update web UI templates and data layer for multi-source support

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/fetch-all-sources.py

@@ -15,7 +15,7 @@ cfg = Config.load()
 db = Database(cfg)
 
 # Only fetch from new sources (IETF and W3C already done recently)
-sources_to_fetch = ["etsi", "itu", "iso"]
+sources_to_fetch = ["etsi", "itu", "iso", "nist"]
 
 total_new = 0
 for source_name in sources_to_fetch: