Personal digest: a private, DM'd feed roundup

[R055LE]

What

Adds a second, privately-curated digest — a feed roundup DM'd to the owner only (or an optional
configured channel), separate feed list and schedule from the existing public digest. Reuses
Digest's existing RSS/feedparser mechanism and shares its LLM budget rather than being a new brain.

Tracks ROADMAP.md item 1 (roadmap and design spec added in this same branch — the roadmap doc is
new, cross-linked from a new companion repo, community-discord,
which holds non-code server/community planning notes).

Built via

Full brainstorming → design spec → implementation plan → subagent-driven-development pipeline:
6 tasks (storage, config, job function, curation tools, scheduling, docs), each implemented and
reviewed independently (one fix round on Task 3 — missing test coverage for a delivery-failure
path), then a final whole-branch review that caught two real bugs no task-level review could see:

• The loop-start gate checked the seed env var instead of self-gating, so feeds curated live via
  chat (the whole point of the curation tools) would never actually get scheduled.
• personal_feeds and the public feeds list share the same dedup table — a URL in both lists
  would only ever be delivered by whichever job runs first each day, silently.

Both fixed (loop now self-gates like Giga Brain's interval check does; the dedup collision is
documented as a known caveat rather than re-architected, given the effort/value tradeoff), plus two
smaller doc gaps (a missing boot-time channel-reachability entry, four tools missing from the
security-posture registry table). Re-reviewed clean.

Details

• New personal_feeds table (mirrors feeds), no migration needed.
• New settings: PERSONAL_DIGEST_FEEDS, PERSONAL_DIGEST_CHANNEL_ID (unset = DM the owner, same
  fallback shape as GIGABRAIN_CHANNEL_ID), PERSONAL_DIGEST_HOUR.
• run_personal_digest_job — same fetch/dedupe/summarize as the public digest, DM-or-channel
  delivery mirroring Giga Brain's periodic check-in.
• Four new owner-only curation tools mirroring the public digest's four (list_personal_feeds,
  suggest_personal_feeds, add_personal_feed, remove_personal_feed) — no admin.py changes
  needed, tools auto-register.
• Scheduled _personal_digest_loop, self-gating, with ops-channel failure alerting.

275 tests passing, ruff clean.

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