Why: Dev #451 cannot pin modules/documents while feature tip and main diverge.
Evidence: merge-tree reports submodule conflict 1048e7c vs 9e4ee27.
Impact: Documents #84 tip includes main@1048e7c plus r1.1/U1 plan.
Refs: Dev PR #451; Documents PR #84
Why: User authorized stage-5 start; record plan status for executors.
Evidence: Chat authorization "开始"; no runtime tests.
Impact: Documents proposal status only.
Refs: 2026-10-12-fast-slow-channel-display-u1-plan.md
Why: Record approved stage-4 design with R03 splits and U1 exit
whitelist, plus stage-5 U1 implementation plan for review.
Evidence: Document edits only; no runtime verification.
Impact: Documents proposals INDEX; no business code.
Refs: feature/fast-slow-display-design
Co-authored-by: Cursor <cursoragent@cursor.com>
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