feat: add Conductor plugin for Context-Driven Development

Add comprehensive Conductor plugin implementing Context-Driven Development
methodology with tracks, specs, and phased implementation plans.

Components:
- 5 commands: setup, new-track, implement, status, revert
- 1 agent: conductor-validator
- 3 skills: context-driven-development, track-management, workflow-patterns
- 18 templates for project artifacts

Documentation updates:
- README.md: Updated counts (68 plugins, 100 agents, 110 skills, 76 tools)
- docs/plugins.md: Added Conductor to Workflows section
- docs/agents.md: Added conductor-validator agent
- docs/agent-skills.md: Added Conductor skills section

Also includes Prettier formatting across all project files.

conductor/templates/track-metadata.json

@@ -0,0 +1,10 @@
+{
+  "id": "",
+  "type": "feature|bug|chore|refactor",
+  "status": "pending|in_progress|completed",
+  "created_at": "",
+  "updated_at": "",
+  "description": "",
+  "spec_path": "",
+  "plan_path": ""
+}