feat: dashboard per-paper browsing + one-tap read/cite/intake actions

[Jammy2211]

Summary

The Dashboard's reading-queue sections now expand to the individual papers (231 today). Each paper links out to read it — its arXiv abstract page when the queue line carries a — <arXiv id or URL> ref, an arXiv title search otherwise — and carries three one-tap actions as prefilled GitHub issue links, so nothing changes state until the human submits the issue:

• 📥 intake into memory (queue-intake) — really interesting: the issue stays open as the full wiki-filing work item, carrying the human's free-text notes:.
• 📑 make citeable (queue-cite) — worth citing, not pivotal: bib entry + a minimal sources section with the notes.
• ✅ read — don't file (queue-read) — processed automatically by the new queue_actions.yml via scripts/queue_mark_done.py: the queue line gets a DONE <date> — prefix (the reading history — never deleted), the commit stages reading-queue.md only, a dashboard re-render is dispatched (token pushes don't retrigger on: push), and the issue closes. Gated on issue author ∈ OWNER/MEMBER/COLLABORATOR — a stranger's issue on this public repo never mutates the queue; unmatched lines get a comment and the issue stays open.

DONE papers render as a collapsed per-section reading history. The markdown render mirrors everything; --json exposes the per-paper list (titles/counts — the pinned privacy level). Badge and README strip are byte-identical (the cross-board contract). board.py stays stdlib-only, fully local-parse, and derives all identity from the git remote (spawn-template portability; without a remote the action buttons are simply absent).

Follow-up to #32/#35 — the per-paper growth path named there. The Mind spawn template DROPs the new workflow (PyAutoMind a5da38cd), mirroring knowledge_board.yml.

API Changes

None — internal changes only. (Repo tooling: the board.py snapshot's queue entries gain a papers list, consumed by the renderers and tests; badge and README-strip surfaces unchanged.)

Test Plan

• pytest tests/ — 25 passed (per-paper parse pins, both link forms, the three issue-link labels, no-remote fallback, queue_mark_done section-scoped idempotent transform, privacy pin)
• make validate — structure + citation lint green
• --html/--md/--badge/--md-brief rendered on the live checkout; badge/strip byte-identical
• Post-merge: labels queue-read / queue-cite / queue-intake exist; submit one queue-read issue and watch queue_actions.yml mark the line DONE and close it

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