Replace single-day task filter with multi-pass sweep when no explicit
target_date: (1) due today, (2) overdue + current month tag, (3) last
month tag, (4) look-ahead 2 days. Deduplicate across passes.
Remove KV store from submit (dedup by job file existence) and result
poller (scan results/ folder directly, move to processed/ after handling).
Scheduler auto-submit no longer passes explicit target_date.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>