DO NOT MERGE — CI proof for #63: deliberate label drift - #70

`src/translations/en.ts` restates the English labels that already exist
inline in the object, view, app, dashboard and dataset definitions, so the
two locale files diff line for line. Nothing checked that the restatement
was still true: rename a label in an object file and the bundle keeps
serving the old string to every English user, because a bundle entry wins
over the source label at runtime.

Measured before this change, on this tree: `pnpm validate`, `pnpm lint
--i18n-strict` and `pnpm typecheck` are all green with a drifted entry, and
green with a missing `en` entry too — `os i18n check` reports `en` at 100 %
(expected 1265 / translated 1265) because the source label counts as the
translation for the default locale. Coverage asks whether a key exists, not
whether it still says what the metadata says.

`scripts/check-i18n-source.mjs` asks the second question. It reads both
sides out of `dist/objectstack.json` and fails on a drifted value, a key
whose metadata is gone, and a source label the bundle never restates. The
source side is collected twice on purpose: `os i18n extract --json` is the
platform's own single definition of what is translatable, so a surface the
platform adds later arrives here for free; a local resolver covers the
view-nested text that walk does not address (a view's default `list`, its
`listViews` and its `formViews`). Together they resolve all 507 keys in
`en.ts` — every key is compared, none is skipped, and a key shape neither
collector knows fails as an orphan rather than passing quietly.

`pnpm lint` chains it, so CI and a laptop run it without a fourth command.
It runs its own `--self-test` first, on every run: seven assertions that the
comparator still reports a mismatch, an orphan and a gap, so the gate proves
in CI that it can fail. The real run refuses to report success when either
side came back empty, or when the artifact is older than `src/`.

Zero findings on this tree today: 507 bundle keys, 507 source labels, 507
compared, 769 platform `metadataForms.*` keys excluded.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PbJ5Cy9KDAzeQHo8bsMadG