Add action log formatter for journal indexing
Implement format_logs() to convert facet action log JSONL files into
indexed markdown chunks. This makes user actions (todo changes, entity
updates, etc.) searchable through the journal index.
- Add format_logs() formatter in think/facets.py
- Register facets/*/logs/*.jsonl pattern in FORMATTERS registry
- Update find_formattable_files() to discover log files
- Topic set to "action" for indexer metadata
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>