[2.11.1] Remove /prime command from plugin

Fixes #41

The /prime command was a personal setup command that shouldn't have been
included in the distributed plugin. It caused confusion when users had
hooks that auto-invoked it on session start.

Users who want a prime command can add it to their personal ~/.claude/commands/

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

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

plugins/compound-engineering/README.md

@@ -7,7 +7,7 @@ AI-powered development tools that get smarter with every use. Make each unit of
 | Component | Count |
 |-----------|-------|
 | Agents | 25 |
-| Commands | 19 |
+| Commands | 17 |
 | Skills | 12 |
 | MCP Servers | 2 |
 
@@ -87,7 +87,6 @@ Core workflow commands use `workflows:` prefix to avoid collisions with built-in
 | `/generate_command` | Generate new slash commands |
 | `/heal-skill` | Fix skill documentation issues |
 | `/plan_review` | Multi-agent plan review in parallel |
-| `/prime` | Prime/setup command |
 | `/report-bug` | Report a bug in the plugin |
 | `/reproduce-bug` | Reproduce bugs using logs and console |
 | `/resolve_parallel` | Resolve TODO comments in parallel |