Three-phase, single-branch plan derived from the modernization
spec. Each phase is one commit with restart-and-validate gates.
Phase 1 fixes critical bugs and removes abandoned plugins;
phase 2 swaps notify/dressing for snacks UI; phase 3 swaps
nvim-cmp for blink.cmp and telescope for snacks.picker.
Plan a three-phase modernization: triage critical bugs and remove
abandoned plugins, swap notify+dressing for snacks UI, and replace
nvim-cmp with blink.cmp + telescope with snacks.picker.