feat: unify commands and skills (v1.2.0)

BREAKING: Commands are now loaded as skills per Claude Code's unified architecture.

Changes:
- Removed separate `commands` field from plugin.json
- Added `./commands/` to `skills` array
- Bumped version to 1.2.0
- Updated description to reflect unified structure

This aligns with Claude Code's documentation which has merged skills and
slash commands into a single concept. Both directories are now loaded
as skills, maintaining backwards compatibility.

Closes #111

.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "everything-claude-code",
-  "version": "1.0.0",
-  "description": "Complete collection of battle-tested Claude Code configs from an Anthropic hackathon winner - agents, skills, hooks, commands, and rules evolved over 10+ months of intensive daily use",
+  "version": "1.2.0",
+  "description": "Complete collection of battle-tested Claude Code configs from an Anthropic hackathon winner - agents, skills, hooks, and rules evolved over 10+ months of intensive daily use",
   "author": {
     "name": "Affaan Mustafa",
     "url": "https://x.com/affaanmustafa"
@@ -14,7 +14,6 @@
     "agents",
     "skills",
     "hooks",
-    "commands",
     "rules",
     "tdd",
     "code-review",
@@ -23,8 +22,7 @@
     "automation",
     "best-practices"
   ],
-  "commands": ["./commands/"],
-  "skills": ["./skills/"],
+  "skills": ["./skills/", "./commands/"],
   "agents": [
     "./agents/architect.md",
     "./agents/build-error-resolver.md",