v8.0.0-rc.11-dev.9: Close out attribute autocomplete project (#30304)

发生了什么

Linked issue n/a — small project closeout; Linear prefix explicitly waived. Delivery merged in #30247 , #30249 , and #30266 . Summary Remove the completed project's two tracked QA artifacts and retain one final-retro lesson in drive/retro/README.md : editor acceptance must verify applied edits, caret placement, and visible follow-up suggestions in the rendered editor, separately from invocation and transport checks.…

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