[2.9.0] Rename plugin to compound-engineering

BREAKING: Plugin renamed from compounding-engineering to compound-engineering.
Users will need to reinstall with the new name:

  claude /plugin install compound-engineering

Changes:
- Renamed plugin directory and all references
- Updated documentation counts (24 agents, 19 commands)
- Added julik-frontend-races-reviewer to docs

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

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

plugins/compound-engineering/commands/workflows/codify.md

@@ -0,0 +1,17 @@
+---
+name: codify
+description: "[DEPRECATED] Use /compound instead - Document solved problems"
+argument-hint: "[optional: brief context about the fix]"
+---
+
+# /codify is deprecated
+
+**This command has been renamed to `/compound`.**
+
+The new name better reflects the compounding engineering philosophy: each documented solution compounds your team's knowledge.
+
+---
+
+Tell the user: "Note: `/codify` has been renamed to `/compound`. Please use `/compound` going forward."
+
+Now run the `/compound` command with the same arguments: #$ARGUMENTS