finding(i18n): `calendar.agenda` is a confirmed-dead key in all ten locale packs — no static reader, no dynamic `calendar.` head, and the enum value it labeled is retired

[os-sam]

Found while implementing #5740 (PR #5782, 'agenda' retired from CalendarViewMode). Filed unassigned as a sub-issue of #4730, whose dead-key backlog this belongs to — recorded there rather than deleted in that PR because packages/i18n was outside the claimed file surface, and a single-key deletion belongs with #4730's namespace-by-namespace sweep anyway (all-locales-key-parity means it must leave all ten packs in one stroke).

Measured (on origin/main 1f94b4c)

• Every locale pack defines it: packages/i18n/src/locales/{en,zh,ja,ko,ru,ar,de,es,fr,pt}.ts under the calendar: namespace (e.g. en.ts:614 agenda: 'Agenda', zh.ts:552 agenda: '日程').
• No reader, by Reverse i18n sweep: ~384 confirmed-dead locale keys across 58 namespaces (workflow/BPMN designer entirely unwired, console.objectView oversized, more) #4730's own evidence standard:
  • No static call site — the only consumer of calendar.* labels is packages/plugin-calendar/src/CalendarView.tsx, whose view switcher renders exactly three items reading t('calendar.day') / t('calendar.week') / t('calendar.month') (lines 327-329), and whose DEFAULT_TRANSLATIONS fallback map (lines 78-84) carries no calendar.agenda entry either.
  • No dynamic head — zero t(`calendar.${...}`) template construction anywhere in packages/ or apps/.
  • No textual footprint — the literal dotted string calendar.agenda appears nowhere in the repo outside the packs.
• Since finding(types/plugin-calendar): view: 'agenda' is declared by CalendarViewMode and the zod enum but the calendar-view renderer silently falls back to 'month' #5740 the labeled value no longer exists: CalendarViewMode is 'month' | 'week' | 'day' and the zod enum matches, so no future reader can arrive without first reopening that contract.

Suggested handling

Fold into #4730's next sweep round: delete calendar.agenda from all ten packs in the same stroke (parity gate requires it). Ten translated strings, zero readers.

Back-links: #5740 (the value retirement and its measurement), #4730 (the dead-key backlog this extends), #4658 (the sweep mechanism).

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