Bump plugin version to 3.5.0

Minor bump for the CLI install notice added in #51: new backward-compatible
behaviour (first-run install prompt, install offer, marker files), no breaking
changes.

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

Author: yavorpanayotov

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "allium",
-  "version": "3.4.0",
+  "version": "3.5.0",
   "description": "Velocity through clarity.",
   "author": {
     "name": "JUXT",

.codex-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "allium",
-  "version": "3.4.0",
+  "version": "3.5.0",
   "description": "Velocity through clarity.",
   "author": {
     "name": "JUXT",