docs: Update changelog for 6.12.0 release

[teamstoolkitworkflowapp]

Auto-generated changelog for 6.12.0 based on compare.

Please review and adjust before merging.

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[github-actions]

⏭️ VscUse Test Plan — Skipped

Branch diff: chore/changelog-6.12.0 → release/6.12

All changed files are test / doc / CI only — no product code was modified.
VscUse UI tests are not required for this PR.

[github-actions]

E2E Test Selection — AI Selected

Why these tests: The only changed file is a CHANGELOG.md (markdown/docs file), which matches rule 9 and requires no e2e tests.

Cases selected (0):

---

View pipeline run

Need to run more tests?

Comment on this PR:

• /e2e-run ./path/to/test.tests.ts — add specific cases to AI selection
• /e2e-run-all — run all e2e cases

Then re-run the workflow.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.98%. Comparing base (20175c8) to head (54f5e16).
⚠️ Report is 1 commits behind head on release/6.12.

Additional details and impacted files

@@              Coverage Diff              @@
##           release/6.12   #16297   +/-   ##
=============================================
  Coverage         86.98%   86.98%           
=============================================
  Files               628      628           
  Lines             32851    32851           
  Branches           7731     7731           
=============================================
  Hits              28576    28576           
  Misses             2434     2434           
  Partials           1841     1841           

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