feat: add spam detection lane (tower.classify.spam) with content-aware filtering
- Add SpamJobData + sync missing job types (DncJobData, ClassifyJobData, P1JobData, etc.) from dist back to source in @tower/types
- spam-detector.ts: emoji-only, short-greeting, link-only detection + duplicate-hash (1h window)
- spam.queue.ts / spam.processor.ts: BullMQ tower.classify.spam lane
- classify.processor.ts: spam check (Step 0) before rule engine, accepts spamQueue param
- main.ts: wire spamQueue + spamWorker; spam pre-filter before ingestQueue.add
- dnc.processor.ts: labelled reason logging
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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