New reusable file_processed_item() that future processors will call to file
completed items from /opt/recon/data/processing/{hash}/ into the library.
Reuses existing organizer logic for domain classification and collision handling.
Not yet wired into the service loop — exists as library code for Phase 3+ to call.
Phase 2 of the refactor. See https://forge.echo6.co/matt/refactored-recon
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
