Why: documents main gained two plans after the index snapshot, and Dev has since merged N2, N3, Q2, and Q3.
Evidence: 21 markdown proposals are present at HEAD; merge SHAs were read from Dev origin/main git log --merges.
Impact: navigation only; proposal bodies and acceptance claims are unchanged.
Refs: Documents #43#44; Dev #244#247#248#249#250#251#253
Why: the index branch was cut before N3 and Q2/Q3 plans landed on main.
Evidence: merge-tree reported no content conflicts against origin/main 16795ed598.
Impact: bring those two proposal files into the index branch without rewriting history.
Refs: documents main
Why: expose existing milestone records and distinguish source observations from combination tests.
Evidence: linked records exist at the fixed source version; proposal blobs and the observation receipt remain unchanged.
Impact: index wording and navigation only; no plan or acceptance decision changes.
Refs: docs/proposals/INDEX.md
Why: author and task-account names do not establish ownership of a plan.
Evidence: independent review found four missing owner fields in the adopted set and N2 also has none; fourteen source headers explicitly name weichen.
Impact: correct the index attribution and clarify the local N2 document adoption boundary; source proposals remain unchanged.
Refs: planning-index review P2; docs/proposals/INDEX.md
Why: make existing directions, milestones and tasks discoverable without treating document claims as acceptance.
Evidence: fixed file blobs, 55 PR API records and Git ancestry are preserved as SELF observations; document links and all 19 proposals are checked.
Impact: navigation and evidence only; original plans, approval scope and business code are unchanged.
Refs: Dev feature/planning-index; docs/proposals/INDEX.md
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