[wgordon17]

Summary

• release/v3.8.50's package.json was bumped to 3.8.50 when the cycle opened (2026-07-28, commit ed2db6cb1), but CHANGELOG.md's ## [Unreleased] header was never renamed to ## [3.8.50] — matching the precedent already visible in ## [3.8.49]'s own "Living section — opened when the cycle started" pattern.
• This mismatch fails check:docs-sync's "latest changelog release matches package.json" gate unconditionally, currently blocking Docs Gates (fast-path) CI on every open PR targeting this base (observed directly on feat(cursor): proactively renews Cursor sessions and fixes manual refresh #9173, fix(sse): make Claude effort/no-think catalog variants dispatchable on every provider #9006, fix(executors): route Claude-via-Vertex through native rawPredict with real streaming #8909).
• Minimal fix: renames the header, restores an empty ## [Unreleased] above it, and mirrors the new section into all 42 docs/i18n/*/CHANGELOG.md locale files via the existing sync-changelog-i18n.mjs tool (no content invented — verified check:docs-sync and check:docs-all's changelog checks pass, plus the 16 existing changelog unit tests).

[diegosouzapw]

Closing as no-op: the 3.8.50 changelog cut this PR opens already exists on release/v3.8.50 (a test-merge yields a tree identical to the base). Thank you @wgordon17 — appreciated the vigilance on release hygiene.