Add import formatter + indexer integration for file importers
Structured file imports (ICS, Obsidian, Kindle, Claude Chat, ChatGPT)
write JSONL to YYYYMMDD/import.{source}/imported.jsonl but had no
formatter registered — imported content was invisible to search and
agents.
- New formatter (think/importers/formatting.py) converts import JSONL
entries into markdown chunks with source-specific formatting
- Registered in FORMATTERS dict so indexer discovers and indexes them
- CLI triggers sol indexer --rescan-file after structured imports
- 15 tests covering all entry types, registration, path metadata,
and end-to-end format_file integration
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>