source.Source is the contract every Collector input implements: Name +
Run(ctx, emit). Sources don't own state — they convert external events
into emit calls. Dispatcher routes.
internal/source/dropfolder: watches ~/Nyx/workspace/incoming/ for
*.json drop files. fsnotify-driven with periodic poll fallback (default
30s safety net for missed events). Each file:
1. Parsed against the spec §3.1.2 schema with DisallowUnknownFields.
2. Valid → emitted, then file deleted.
3. Invalid (missing fields, bad type/priority, unknown fields, garbage)
→ moved to .dead-letter/ with a sidecar .reason file for forensics.
4. Emit failure → file retained in place for retry (transient errors
shouldn't be permanent dead-letters).
Also: initial-scan on Run() drains files that landed before the watcher
attached, catching up after a Collector restart.
14 tests in the package — schema validation table for all error cases,
initial-scan, live inotify drop, post-emit delete, dead-letter +
sidecar, emit-failure retention. Plus the 7 inbox tests still passing.
Pinned fsnotify v1.7.0 (Go 1.22 compatible; 1.10.x demanded toolchain
1.23 which isn't in apt yet). go.mod stays at 1.22 to match VPS.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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