feat: migrate AI-DLC plugin to repository root

Migrate the AI-DLC methodology plugin from patterns/ai-dlc in the han
repository to this standalone repository. Files are now at the repository
root to support standard GitHub plugin installation (thebushidocollective/ai-dlc).

Key changes:
- Move all plugin files (.claude-plugin, commands, skills, hats, hooks, lib) to root
- Update plugin.json repository URL to thebushidocollective/ai-dlc
- Update homepage to ai-dlc.dev
- Update README with comprehensive documentation and installation instructions
- Update package.json workspaces to only include website
- Remove old plugin/ directory placeholder

Installation now works via:
- han plugin install thebushidocollective/ai-dlc
- /install-github-plugin thebushidocollective/ai-dlc

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

Author: jwaldrip

.claude-plugin/hooks.json

@@ -0,0 +1,17 @@
+{
+  "description": "AI-DLC hooks registered directly with Claude Code for structured responses",
+  "hooks": {
+    "PreToolUse": [
+      {
+        "matcher": "EnterPlanMode",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "bash \"${CLAUDE_LOCAL_PLUGIN_DIR}/hooks/redirect-plan-mode.sh\"",
+            "timeout": 5000
+          }
+        ]
+      }
+    ]
+  }
+}

.claude-plugin/plugin.json

@@ -0,0 +1,22 @@
+{
+  "name": "ai-dlc",
+  "version": "1.1.0",
+  "description": "AI-DLC 2026 methodology - iterative AI-driven development with hat-based workflows, completion criteria, and automatic context preservation",
+  "author": {
+    "name": "The Bushido Collective",
+    "url": "https://thebushido.co"
+  },
+  "homepage": "https://ai-dlc.dev",
+  "repository": "https://github.com/thebushidocollective/ai-dlc",
+  "license": "Apache-2.0",
+  "keywords": [
+    "ai-dlc",
+    "methodology",
+    "workflow",
+    "iteration",
+    "completion-criteria",
+    "hat-switching",
+    "context-preservation",
+    "human-ai-collaboration"
+  ]
+}