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/commands/instinct-import.md

@@ -0,0 +1,88 @@
+---
+description: Import instincts from external sources
+agent: build
+---
+
+# Instinct Import Command
+
+Import instincts from a file or URL: $ARGUMENTS
+
+## Your Task
+
+Import instincts into the continuous-learning-v2 system.
+
+## Import Sources
+
+### File Import
+```
+/instinct-import path/to/instincts.json
+```
+
+### URL Import
+```
+/instinct-import https://example.com/instincts.json
+```
+
+### Team Share Import
+```
+/instinct-import @teammate/instincts
+```
+
+## Import Format
+
+Expected JSON structure:
+
+```json
+{
+  "instincts": [
+    {
+      "trigger": "[situation description]",
+      "action": "[recommended action]",
+      "confidence": 0.7,
+      "category": "coding",
+      "source": "imported"
+    }
+  ],
+  "metadata": {
+    "version": "1.0",
+    "exported": "2025-01-15T10:00:00Z",
+    "author": "username"
+  }
+}
+```
+
+## Import Process
+
+1. **Validate format** - Check JSON structure
+2. **Deduplicate** - Skip existing instincts
+3. **Adjust confidence** - Reduce confidence for imports (×0.8)
+4. **Merge** - Add to local instinct store
+5. **Report** - Show import summary
+
+## Import Report
+
+```
+Import Summary
+==============
+Source: [path or URL]
+Total in file: X
+Imported: Y
+Skipped (duplicates): Z
+Errors: W
+
+Imported Instincts:
+- [trigger] (confidence: 0.XX)
+- [trigger] (confidence: 0.XX)
+...
+```
+
+## Conflict Resolution
+
+When importing duplicates:
+- Keep higher confidence version
+- Merge application counts
+- Update timestamp
+
+---
+
+**TIP**: Review imported instincts with `/instinct-status` after import.