[changl]

Sandbox servers could claim an unbound port reserved for another page, and different card publishers could reuse a page number. Refuse server startup on another page's registered port and make automatic allocation skip reservations; reserve card numbers under the existing store lock across single creates, batches, and edits, with a conflict receipt naming the occupied comment/version and next free number.

Existing duplicate stores remain unchanged: live/current cards retain their base number and older duplicates use labels such as #41·2, leaving new plain numbers available. CLI, browser badges, resolve/withdraw, and finding lookup agree. Re-publishing the same numbered question at the same anchor updates the same card, and unnumbered re-asks retain approval lineage.

Validation:

• Both beads reproduced on 064b1d5 (2.28.0) with failing regressions before product edits; real duplicate 10/12/41 history checked through read-only temporary snapshots.
• Non-browser chunks: A–F 712 passed/2 skipped; G–P 616 passed; Q–Z 370 passed; monitor 16 passed.
• Full browser chunks ran: A–F 101 passed/2 failed, G–P 45 passed/1 failed, Q–Z 91 passed/2 failed. The approval/numbering failures are corrected and covered by a fresh 10-test approval+UI run plus the final suffix-badge regression; the outside-link timeout passed an isolated rerun.
• Two remaining browser failures reproduce on isolated, exact 2.28.0 source: cross-tab draft propagation and the dark desktop ticket-popup test. The coordinator owns these separately.
• Ruff, changed JS syntax, and whitespace checks pass. Unreleased changelog entries added; live pages were never written, restarted, or published.
• GitHub Checks passed on e5a2e52; ready for review against changl/fixes.

Beads: agent-annotate-zv7, agent-annotate-lw1 (left open as requested).