Drop pinned version from plugin.json

Without a version field, Claude Code falls back to the git commit SHA,
so every push to main is treated as a new release. Avoids the trap
where added skills/commands sit unused because the pinned version
string never changed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

plugins/willow-pmtools/.claude-plugin/plugin.json

@@ -2,7 +2,6 @@
   "$schema": "https://json.schemastore.org/claude-code-plugin.json",
   "name": "willow-pmtools",
   "displayName": "WilloW-PMTools",
-  "version": "1.0.0",
   "description": "Project management tools for Willowbrook — chat with the company's todo system, browse lists, and create or complete tasks from any Cowork conversation.",
   "author": {
     "name": "Willowbrook",