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