Switch to Nextcloud-major-aligned versioning starting at 34.0.0

Leading version number now tracks the supported Nextcloud major
(currently 34, i.e. Hub 26 Spring) instead of an independent 0.x
count, so compatibility is visible at a glance. Documents the scheme
in CLAUDE.md's release process section.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "workflow_deck_automation",
-	"version": "0.2.3",
+	"version": "34.0.0",
 	"private": true,
 	"type": "module",
 	"description": "Automates moving overdue Deck cards between stacks, configurable per user.",