Add flag-routing infra (parseFlags) + two subcommands to the brain CLI, keeping
the existing `init` branch intact:
- `ingest --file <path> [--source] [--date]` / `ingest --scan-inbox` → capture
published posts into ingest/published/ (Wrote / Duplicate / Collision report).
- `published list [--json]` → inspect the gold corpus (id · provenance · date · first line).
6 subprocess tests incl. an explicit `init` regression guard. brain 57→63 tests, tsc clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RigJBiRFNtFZKCz21qNbQ4
