fix: pin ruff <0.5 in CI to match local formatting, reset version to 3.0.11

CI was installing latest ruff (0.15.x) which has different formatting
rules than our local 0.4.x. Pin to ruff>=0.4.0,<0.5 for consistency.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.codex-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "mempalace",
-  "version": "3.0.12",
+  "version": "3.0.11",
   "description": "Give your AI a memory — mine projects and conversations into a searchable palace. 19 MCP tools, auto-save hooks, and guided setup.",
   "author": {
     "name": "milla-jovovich"