feat: complete OpenCode plugin support with hooks, tools, and commands

Major OpenCode integration overhaul:

- llms.txt: Comprehensive OpenCode documentation for LLMs (642 lines)
- .opencode/plugins/ecc-hooks.ts: All Claude Code hooks translated to OpenCode's plugin system
- .opencode/tools/*.ts: 3 custom tools (run-tests, check-coverage, security-audit)
- .opencode/commands/*.md: All 24 commands in OpenCode format
- .opencode/package.json: npm package structure for opencode-ecc
- .opencode/index.ts: Main plugin entry point

- Delete incorrect LIMITATIONS.md (hooks ARE supported via plugins)
- Rewrite MIGRATION.md with correct hook event mapping
- Update README.md OpenCode section to show full feature parity

OpenCode has 20+ events vs Claude Code's 3 phases:
- PreToolUse → tool.execute.before
- PostToolUse → tool.execute.after
- Stop → session.idle
- SessionStart → session.created
- SessionEnd → session.deleted
- Plus: file.edited, file.watcher.updated, permission.asked, todo.updated

- 12 agents: Full parity
- 24 commands: Full parity (+1 from original 23)
- 16 skills: Full parity
- Hooks: OpenCode has MORE (20+ events vs 3 phases)
- Custom Tools: 3 native OpenCode tools

The OpenCode configuration can now be:
1. Used directly: cd everything-claude-code && opencode
2. Installed via npm: npm install opencode-ecc

.opencode/index.ts

@@ -0,0 +1,71 @@
+/**
+ * Everything Claude Code (ECC) Plugin for OpenCode
+ *
+ * This package provides a complete OpenCode plugin with:
+ * - 12 specialized agents (planner, architect, code-reviewer, etc.)
+ * - 24 commands (/plan, /tdd, /code-review, etc.)
+ * - Plugin hooks (auto-format, TypeScript check, console.log warning, etc.)
+ * - Custom tools (run-tests, check-coverage, security-audit)
+ * - 16 skills (coding-standards, security-review, tdd-workflow, etc.)
+ *
+ * Usage:
+ *
+ * Option 1: Install via npm
+ * ```bash
+ * npm install opencode-ecc
+ * ```
+ *
+ * Then add to your opencode.json:
+ * ```json
+ * {
+ *   "plugin": ["opencode-ecc"]
+ * }
+ * ```
+ *
+ * Option 2: Clone and use directly
+ * ```bash
+ * git clone https://github.com/affaan-m/everything-claude-code
+ * cd everything-claude-code
+ * opencode
+ * ```
+ *
+ * @packageDocumentation
+ */
+
+// Export the main plugin
+export { ECCHooksPlugin, default } from "./plugins/index.js"
+
+// Export individual components for selective use
+export * from "./plugins/index.js"
+
+// Version export
+export const VERSION = "1.0.0"
+
+// Plugin metadata
+export const metadata = {
+  name: "opencode-ecc",
+  version: VERSION,
+  description: "Everything Claude Code plugin for OpenCode",
+  author: "affaan-m",
+  features: {
+    agents: 12,
+    commands: 24,
+    skills: 16,
+    hookEvents: [
+      "file.edited",
+      "tool.execute.before",
+      "tool.execute.after",
+      "session.created",
+      "session.idle",
+      "session.deleted",
+      "file.watcher.updated",
+      "permission.asked",
+      "todo.updated",
+    ],
+    customTools: [
+      "run-tests",
+      "check-coverage",
+      "security-audit",
+    ],
+  },
+}