chore(release): sync 3.3.4 version bump back into develop

The v3.3.4 release prep landed on main but was never merged back into
develop, leaving every version-bearing file one release behind. Bumps
pyproject.toml, mempalace/version.py, both plugin manifests, the
marketplace entry, the README badge, and the lockfile to 3.3.4 to match
the tagged release.

.codex-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "mempalace",
-  "version": "3.3.3",
+  "version": "3.3.4",
   "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"