feat: enhanced digest and publishing workflow (Features A-D)

[dream-hermes-agent]

Summary

Implements the enhanced digest and publishing workflow from DIGEST.md using TDD.

Feature A — Review Addendum (§2)

• review_addendum.py: trigger detection (Telegram + CLI marker file), addendum block builder, Q&A parser
• review_questions.py: conditional question generation — Q1+Q4 always, Q2-Q5 triggered by session signals
• session_digest.py --review YYYY-MM-DD: CLI workflow for review dialog

Feature B — Where This Leads (§3)

• forward_links.py: trigger detection, contextual links (GitHub issues/PRs/commits + external URLs), future anchors (TODO items, follow-ups, deferred decisions)
• insight_store.py: digest_insights.yaml schema with full lifecycle (active→resolved/promoted/parked), standalone_candidate flag at ≥3 digest references

Feature C — Deep-Dive Promotion (§4)

• blog_post_editor.py: promote_to_deep_dive() with spec front matter (title, date, tags: [deep-dive, ...], digest_sources: [...], layout: post), push_updated_post() for blog repo clone/commit/push

Feature D — Media Queue (§5.8)

• media_queue.py: queue PNG/JPG/WebP/MP4/WebM files, format_markdown_embed() with ![] empty alt text
• Blog post embedding via blog_post_editor.insert_media_embed()

Config & Docs

• digest_config_TEMPLATE.yaml: new review, forward_links, deep_dive, media sections
• SKILL.md: updated to v5.0.0 with all new features documented
• README.md: new features section with usage examples

CI & Tests

• .github/workflows/test.yml: pytest CI on push + PR (Ubuntu, Python 3.11)
• 102 tests: unit (38) + integration (19) + regression (45) — all passing

Bug fixes (from TDD)

• forward_links.extract_future_anchors(): parse plain - Item bullets before regex fallback
• insight_store._update_standalone_candidate(): exclude initial first_seen from threshold count
• media_queue.format_markdown_embed(): use ![] empty alt text (spec §5.6)
• review_addendum.build_review_addendum(): include date_str in trigger timestamp
• sample_session_with_urls fixture: added bullet content so Future Anchors subsection renders

Testing

Run python3 -m pytest tests/ -v — 102 passed in 0.11s.