[Jammy2211]

The problem

The Dashboard's paper links were arXiv title searches for 230 of the 232
queued papers, and there was no way to reach a PDF at all. Collecting a stack of
papers on a phone (before a flight, say) cost a search page, a squint and several
taps each.

The two symptoms are one cause: paper_url() could only build an abstract page
when the queue line ended — <arXiv id>, and only 2 of 232 waiting lines carry
one — the two the nightly digest's ➕ button added. The rest are bare titles from
the historical bulk paste.

The change

📄 PDF button. Every reading-queue and arXiv-inbox paper with a ref renders a
chip straight to arxiv.org/pdf/<id>, ahead of the filing actions, opening in a
new tab so collecting a dozen does not keep navigating the board away.
Extensionless URL, so a phone opens it in the built-in viewer. No ref, no button
— the board never shows a control that cannot work.

Refs, so there is something to link. scripts/arxiv_refs.py holds the ref
grammar in one place: every shape the queue has carried (bare id, arXiv:, abs
URL, /pdf/….pdf, pre-2007 astro-ph/…) normalises to one id, from which the
abstract page and the PDF follow. A side effect is that a ref written as a
/pdf/ URL now titles onto the abstract page like every other paper.

The backlog. scripts/backfill_arxiv_refs.py resolves ref-less titles
against the arXiv API and appends an id only when exactly one paper's
normalised title matches — a wrong id sends the reader confidently to somebody
else's paper, which is worse than a search box. .github/workflows/arxiv_refs.yml
runs it nightly: idempotent, resumable, capped per run, and it goes quiet once
the queue is drained.

The board itself stays fully local — rendered from the checkout with no network,
never calling the resolver.

Notes

• scripts/spawn.py in PyAutoMind gains the matching DROP rule for the new
  workflow (PyAutoLabs/PyAutoMind#same-branch) — MEMORY_RULES has no catch-all,
  so a new Memory workflow is UNMATCHED until a human decides. Merge that first.
• 20 new tests (tests/test_arxiv_refs.py, extensions to tests/test_board.py);
  107 pass, make validate clean.

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