docs: Update changelog for 6.12.0 release

[teamstoolkitworkflowapp]

Auto-generated changelog for 6.12.0 (dev branch copy).

Please review and adjust before merging.

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[github-actions]

⏭️ VscUse Test Plan — Skipped

Branch diff: chore/changelog-6.12.0-dev → dev

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 packages/vscode-extension/CHANGELOG.md, which is a documentation-only markdown file; per rule 9 (*.md → empty array), no e2e tests are needed.

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 87.06%. Comparing base (4c1a2be) to head (5c1ffba).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #16298   +/-   ##
=======================================
  Coverage   87.06%   87.06%           
=======================================
  Files         628      628           
  Lines       33087    33087           
  Branches     7711     7711           
=======================================
  Hits        28808    28808           
  Misses       2436     2436           
  Partials     1843     1843           

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