docs: drop released v1.2.0 entries from Unreleased and archive v1.2.0 [no ci]

[TheGupta2012]

Summary

v1.2.0 shipped on 27 August 2026, but CHANGELOG.md was never reset afterwards. Compare the v1.2.0 release notes against ## Unreleased on main: the three Fixed entries and the five Other entries (#412, #411, #414, #413, #383) are already published there. The Past Release Notes list also stops at v1.1.0.

Without this fix, the 1.2.1 release notes generated from Unreleased would re-announce all eight entries.

What changed

• Removed the eight Unreleased entries that shipped in v1.2.0. Fixed is now empty; Other keeps only the two ci: cancel superseded runs and trim the PR wheel matrix #419 entries.
• Added v1.2.0 to the top of Past Release Notes, matching how v1.1.0 and earlier are archived.

Net: CHANGELOG.md, +1 / -8. No other file is touched. Unreleased now holds exactly the work merged after the v1.2.0 tag (#377, #378, #419, #427), which is what 1.2.1 will ship.

Follow-up

After 1.2.1 is published, a second [no ci] PR should empty Unreleased and archive v1.2.1, so this does not recur.

🤖 Generated with Claude Code

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[TheGupta2012]

merging as only changelog