feat: OpenCode v1.1.1 permission system compatibility (#489)

* feat: add OpenCode v1.1.1 version detection and permission compatibility utilities

- Add opencode-version.ts: Detect installed OpenCode version and support API
- Add permission-compat.ts: Compatibility layer for permission system migration
- Add comprehensive tests (418 lines total)
- Export new utilities from shared/index.ts

🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)

* fix: update agent permission configs for OpenCode v1.1.1 compatibility

- Fix document-writer: change invalid 'permission: { background_task: deny }' to 'tools: { background_task: false }'
- Fix explore: split 'permission' and 'tools' config, move tool-level denials to 'tools' key
- Fix oracle: split 'permission' and 'tools' config, move tool-level denials to 'tools' key
- Align all agents with v1.1.1 permission system structure

🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)

src/agents/oracle.ts

@@ -103,7 +103,8 @@ export function createOracleAgent(model: string = DEFAULT_MODEL): AgentConfig {
     mode: "subagent" as const,
     model,
     temperature: 0.1,
-    permission: { write: "deny", edit: "deny", task: "deny", background_task: "deny" },
+    tools: { write: false, task: false, background_task: false },
+    permission: { edit: "deny" as const },
     prompt: ORACLE_SYSTEM_PROMPT,
   }