intake dashboard: Epics section under In flight + markdown-version links

[Jammy2211]

For PyAutoLabs/PyAutoMind#251.

• parse_epics reads a new Mind root registry epics.md (same H2-slug + - key: value shape as active.md; fields title/ledger/status/notes; absent file → no section, so freshly-spawned Minds are unaffected).
• Both renderers gain an Epics section directly under In flight. Each epic's 📋 payload is a procedure, not a snapshot: read the ledger (+ DECISIONS/RESULTS beside it), cross-check epics.md/active.md and open issues/PRs, work out the last completed phase, continue from the next logical step via /start_dev, updating the ledger. Nothing phase-specific is baked in, so the button never goes stale.
• html sections now each link their markdown source ("markdown version": In flight → active.md, Epics → epics.md, Parked/Planned → their files, Backlog → the draft/ tree) — per the user's follow-up request.
• Counts table untouched (organism-router contract). Tests: 23 passed (3 new).

Merge before the PyAutoMind PR (dashboard_refresh renders with Brain main).

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