Platform locale table (ruling F of #29349): one list of 11 languages in spec, complete on every surface #29428

Context

#29349 was ruled F on 2026-11-02 (maintainer, verbatim on that card). Its terms:

• The platform supports one list of languages, and every language on it is complete on every surface: Console UI, platform metadata, built-in emails, cloud, mobile and the marketing site.
• There are no tiers.
• Adding a language means changing the list and then backfilling once. Removing one works the same way.
• The same-PR follow rule stays, and no new gate is added.

Today.

• Console UI: 10 packs, short codes, no zh-Hant.
• Platform metadata: 4 locales (en, zh-CN, ja-JP, es-ES).
• Built-in emails: 4 locales, with en-US as the floor.

The measured detail is in #29349.

Phases (one card each; the triage seat splits them)

1. spec: the table.
   • Export the list from packages/spec/src/system, for example PLATFORM_LOCALES with rows { tag, label, rtl }. Today no such symbol exists: git grep -n PLATFORM_LOCALES origin/main -- packages/spec/src returns nothing.
   • Declare the read aliases that keep stored values valid and map them to table tags: zh, zh-CN, zh-SG → zh-Hans; zh-TW, zh-HK, zh-MO → zh-Hant; ja-JP → ja; es-ES → es; pt → pt-BR; en-US → en. New writes use table tags.
   • content/docs/protocol/kernel/i18n-standard.mdx gains the table and the rule: same-PR follow, and a language is added by changing the table and backfilling once.
   • Fix the AGENTS.md:647 drift: it says "nine packages … three services", but there are ten directories and four services.
2. Console UI.
   • ui/packages/i18n reads its locale set from the table and adds zh-Hant. Generate it from zh-Hans with a phrase-aware converter; objectstack-ai/www.objectos.ai scripts/gen-zh-hant.mjs is the precedent.
   • Pack keys move to table tags. Aliases keep sys_user.locale values and Accept-Language resolution working, and the region-fallback test covers both scripts.
   • Parity and en-drift tests read the table.
3. Platform metadata and built-in emails.
   • i18n:extract --locales and check-i18n-bundles.mjs read the table.
   • Backfill the seven missing locales in every translations/ package (one PR per package, AI-written, same quality bar as [Decision] Repeater row-property localisation: 604 catalog leaves across four locales — who authors the translated copy? #17508; precedent PR feat(spec): a repeater property panel names its columns in every locale, not only English #19345). Do the same for the 8 built-in email templates.
   • EMAIL_TEMPLATE_FLOOR_LOCALE = 'en-US' versus the table's en is a protocol change, so this phase decides it in its own PR, with aliases.
4. Locale menu. The Console language menu offers the table's languages (intersected with an app's declared supportedLocales, as today), each one now complete.

Downstream, filed separately:

• Languages: follow the phone's language in the platform's 11 locales (ruling F of objectstack#29349) mobile#159: the shell ships the same 11, using table tags.
• objectstack-ai/cloud: the pricing redirect locales card, plus service-tenant translations and service-ai copy to 11 (objectstack-ai/cloud#2988 folds in).
• objectstack-ai/www.objectos.ai: the site completes the 11.

Acceptance

• One exported table drives the UI pack set, metadata extraction, bundle checks and docs. A language missing on any surface turns an existing gate red.
• Stored values in old codes keep resolving, and a test pins each alias.
• [Decision] One locale list, one completeness rule — the long-term i18n regime across Console, platform metadata, cloud and mobile #29349 is closed when phase 1 lands with the downstream cards linked.