ci(docs): remove permanently red catalog freshness check

[proggeramlug]

Fixes #10955.

The Docs checks job regenerated every gettext catalog and required a byte-for-byte clean diff. This has been permanently red: gettext rewraps obsolete #~ entries, and the catalogs on main also contain active drift after a prior mass regeneration was reverted because it removed existing translations (43200e9d41). Filtering obsolete entries alone therefore cannot make this check pass. As the issue proposes, this removes the freshness gate while retaining msgfmt syntax/format validation and the English plus all-translations build. The job is renamed to match what it now checks.

Validation:

• msgfmt --check --check-format --statistics passes for all ten .po catalogs.
• PATH=/tmp/perry-mdbook-054:$PATH ./docs/i18n.sh build-all builds English and all ten translations with mdBook v0.5.4 and mdbook-i18n-helpers v0.4.0.
• git diff --check passes.
• GitHub Docs checks build-and-validation passed on the PR head: https://github.com/PerryTS/perry/actions/runs/35726226687

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⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between c1569e2 and 8d9cf70.

📒 Files selected for processing (2)

• .github/workflows/docs-check.yml
• changelog.d/10972-docs-catalog-validation.md

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📝 Walkthrough

Walkthrough

The documentation workflow now validates committed gettext catalogs with msgfmt instead of regenerating them. The workflow job name changed, and the changelog documents the new validation behavior.

Changes

Documentation workflow validation

Layer / File(s)	Summary
Catalog validation workflow .github/workflows/docs-check.yml, changelog.d/10972-docs-catalog-validation.md	The job is renamed to build-and-validation. The workflow validates each existing catalog with msgfmt without regenerating files. The changelog records the change.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 8d9cf

The workflow now validates committed catalogs and builds all translations without failing on harmless obsolete-entry reformatting, so the change is ready to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR addresses #10955 by removing the permanently failing catalog freshness diff check. The workflow now validates each committed catalog with msgfmt --check --check-format --statistics and retain…
Out of Scope Changes check	✅ Passed	The changes are limited to the Docs workflow and a changelog entry. Renaming the job and documenting catalog validation directly support #10955. No unrelated implementation changes are shown.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Title check	✅ Passed	The title clearly identifies the primary change: removing the permanently failing documentation catalog freshness check.
Description check	✅ Passed	The description explains the problem, the implemented workflow changes, the linked issue, and the validation results. It does not reproduce every template heading or checklist item, but it contains th…

✨ Finishing Touches

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[proggeramlug]

Landed on main in merge train 256 (#11018, v0.5.1638), main f5cfbff882.

Carried at head 8d9cf7094e. The landed tree is byte-identical to the validated train tree (9b108dd3c9), and CI on the train head passed every job except the known public-baseline lint step: all 6 gap shards, cargo-test, e2e-scoped, gc-stress, check, warnings and security-audit green.

Trains rebase-merge, so commits get new SHAs and GitHub cannot mark this PR merged. Closed as landed.