feat: Add proof skill and optional Proof sharing in plan/brainstorm workflows (v2.37.0)

Merges feat/proof-integration with conflict resolution:
- proof skill for creating/editing/sharing markdown docs via Proof API
- "Share to Proof" added as opt-in menu option in /workflows:brainstorm Phase 4
- "Share to Proof" added as opt-in menu option in /workflows:plan Post-Generation Options
- Bumped version 2.36.0 → 2.37.0 to avoid conflict with OpenClaw/Qwen/Windsurf release

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

plugins/compound-engineering/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "compound-engineering",
-  "version": "2.35.2",
-  "description": "AI-powered development tools. 29 agents, 22 commands, 19 skills, 1 MCP server for code review, research, design, and workflow automation.",
+  "version": "2.37.0",
+  "description": "AI-powered development tools. 29 agents, 22 commands, 20 skills, 1 MCP server for code review, research, design, and workflow automation.",
   "author": {
     "name": "Kieran Klaassen",
     "email": "kieran@every.to",