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gsxdsm 083ebf8134 FN-6780: make i18n status check key parity

Make i18n status enforce catalog key parity while allowing empty fallback placeholders.

- Add a reusable i18n parity checker that reports missing and orphaned keys across secondary locales.
- Route pnpm i18n:status through the project parity gate and keep the upstream completeness report as i18n:status:report.
- Document that empty secondary locale strings are valid fallback placeholders and cover parity behavior with tests.

Files changed:
 docs/i18n-contributing.md                   |  18 +++-
 i18next.config.ts                           |  13 ++-
 package.json                                |   3 +-
 packages/i18n/scripts/check-i18n-parity.mjs | 110 +++++++++++++++++++++++
 packages/i18n/src/__tests__/config.test.ts  |   2 +-
 packages/i18n/src/__tests__/parity.test.ts  | 130 ++++++++++++++++++++++++++++
 packages/i18n/src/parity.ts                 | 126 +++++++++++++++++++++++++++
 7 files changed, 393 insertions(+), 9 deletions(-)

Fusion-Task-Id: FN-6780

Fusion-Task-Lineage: f687586a-bc09-4f9d-843f-b7205eb40a58

2026-06-20 06:46:35 -07:00