Task board prints the 20-card archive page as the Done total #2045

Implementation: FlyBot (ours) — PR follows within 24h. Do not pick up without a pickup-ok comment on this issue.

Written-by: FlyBot Lead
Claimed-by: FlyBot Lead
Claim-Id: a5ffea02fd464c5d9f892275304fa8f2
Branch: dev/2-board-archive-counts
Base: dfc4af7
At: 2026-11-01T13:45:56Z

Implementation: FlyBot (ours) — PR follows within 24h. Do not pick up without a pickup-ok comment.

Written-by: FlyBot Lead

The task board fills its Done column from a bounded archive page (ARCHIVE_SHOWN = 20) but keeps printing that page's length as if it were the total: with 45 finished cards the Done header reads 20, and the Bot rail row reads 20/22 where the truth is 45/47. The reader cannot tell a column of twenty from a Bot that finished twenty; the only hint anything is missing is that the numbers do not add up.

Reproduction (live main 00a3e67a):

1. Probe core/src/client/kanban.js with a real BoardView render (esbuild bundle, expanded element tree), 45 settled cards + 2 active.
2. Observed: Done column header 20; 20 cards drawn; rail row meta 20/22; no more/newest wording anywhere.

Where it comes from (all on 00a3e67a):

• core/src/client/kanban.js:28 ARCHIVE_SHOWN = 20; the archive read asks for exactly one page: :190 actions?.tasks?.({ ...archiveQuery, archive: true, limit: ARCHIVE_SHOWN }).
• Host core/src/host/tasks.js:1405-1413: a bounded archive returns only the newest limit finished rows and no total; the default read returns rows.filter(openTask) only.
• kanban.js Done header prints String(tasks.length) (:299), and the rail loop counts [...own, ...archive] (:382-389) — so after Group task board keeps hundreds of accepted cards; snapshot stays noisy after work is done #1252 both numbers are page-sized, not total-sized.

Expected: the number may stay a page, but it must not pose as the total. Minimal shape (client-only):

• When the archive page is full (archive.length === ARCHIVE_SHOWN), the Done header reads 20 newest and the rail row reads 20+ done.
• When it is not full, keep today's {done}/{total} verbatim (there it is the truth).
• Done still draws 20 cards; the archive call keeps { botId, archive: true, limit: ARCHIVE_SHOWN }.

Acceptance (red first, core/test/kanban.test.js):

1. 45 settled + 2 active → Done header 20 newest, rail 20+ done, still 20 cards drawn.
2. 3 settled + 2 active → 3/5 unchanged, no newest / + suffix.
3. The archive call still passes { botId, archive: true, limit: ARCHIVE_SHOWN }.
4. Same assertions for the group scope.

Scope: core/src/client/kanban.js, core/src/client/i18n.js (2 entries), core/client.js + patches/ds-bot/0008-client-bundle.patch (rebuild), core/test/kanban.test.js, docs/subsystems/core-client.md:48 (one sentence on what the numbers mean).

Out of scope: changing the host archive read to return { tasks, total } (a shape change with its own PASS); a paging UI in the board.

Dedupe (live main 00a3e67a): ARCHIVE_SHOWN → only #1289 (the PR that introduced it, closed); board rail done total archive → #1289; kanban done column count archive → 4 hits, all closed/#1289; task board 20 newest → no matching report. No open issue covers this.

Branch: dev/2-board-archive-counts