chore(release): v2.0.5 — multi-record plan cells

A plan cell now holds up to 3 records: additive assignments + day
exceptions, via the layered entries/overrides model (no migration).
resolveCell/resolveGrid return arrays; cap enforced per layer on create;
grid renders up to 3 stacked; cell editor is a day panel (list/add/edit,
layer-aware add); dashboard "today" card shows up to 3.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "app-ts",
-  "version": "2.0.4",
+  "version": "2.0.5",
   "description": "",
   "main": "dist/server.js",
   "scripts": {