fix: use explicit file paths for agents in plugin.json

Fixes plugin installation validation error: "agents: Invalid input"

The plugin manifest validator requires explicit file paths for agents,
not directory paths. Changed format:
- "agents": "./agents" → explicit file path array
- Added version field (required by validator)
- Changed commands/skills to array format for consistency

This matches the format used by other working plugins (e.g.,
Parslee-ai/neo uses explicit file paths for agents).

Validated with: claude plugin validate .claude-plugin/plugin.json

Fixes #90

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude-plugin/plugin.json

@@ -1,5 +1,6 @@
 {
   "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",
   "author": {
     "name": "Affaan Mustafa",
@@ -22,8 +23,21 @@
     "automation",
     "best-practices"
   ],
-  "commands": "./commands",
+  "commands": ["./commands/"],
-  "skills": "./skills",
+  "skills": ["./skills/"],
-  "agents": "./agents",
+  "agents": [
+    "./agents/architect.md",
+    "./agents/build-error-resolver.md",
+    "./agents/code-reviewer.md",
+    "./agents/database-reviewer.md",
+    "./agents/doc-updater.md",
+    "./agents/e2e-runner.md",
+    "./agents/go-build-resolver.md",
+    "./agents/go-reviewer.md",
+    "./agents/planner.md",
+    "./agents/refactor-cleaner.md",
+    "./agents/security-reviewer.md",
+    "./agents/tdd-guide.md"
+  ],
   "hooks": "./hooks/hooks.json"
 }