* docs(release): prepare v1.17.21 notes

Summary:
Generate a bilingual, product-focused draft from merged pull request metadata. Reuse the selected release-bound PR when one is available.

Verification:
Validate the catalog, citations, bilingual fields, and rendered GitHub release notes before committing.

* docs(release): complete v1.17.21 notes

Summary:
Expand the release surfaces beyond Desktop and add the missing CLI diagnostics and recovery ownership changes from PR #6912.

Verification:
Validated the release catalog, rendered the bilingual notes, ran the catalog tests, and checked the diff for whitespace errors.

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>