refactor: remove legacy tools format, use permission only

BREAKING: Requires OpenCode 1.1.1+

- Remove supportsNewPermissionSystem/usesLegacyToolsSystem checks
- Simplify permission-compat.ts to permission format only
- Unify explore/librarian deny lists: write, edit, task, sisyphus_task, call_omo_agent
- Add sisyphus_task to oracle deny list
- Update agent-tool-restrictions.ts with correct per-agent restrictions
- Clean config-handler.ts conditional version checks
- Update tests for simplified API

src/agents/sisyphus.ts

@@ -618,9 +618,7 @@ export function createSisyphusAgent(
     ? buildDynamicSisyphusPrompt(availableAgents, tools, skills)
     : buildDynamicSisyphusPrompt([], tools, skills)
 
-  // Note: question permission allows agent to ask user questions via OpenCode's QuestionTool
-  // SDK type doesn't include 'question' yet, but OpenCode runtime supports it
-  const permission = { question: "allow" } as AgentConfig["permission"]
+  const permission = { question: "allow", call_omo_agent: "deny" } as AgentConfig["permission"]
   const base = {
     description:
       "Sisyphus - Powerful AI orchestrator from OhMyOpenCode. Plans obsessively with todos, assesses search complexity before exploration, delegates strategically to specialized agents. Uses explore for internal code (parallel-friendly), librarian only for external docs, and always delegates UI work to frontend engineer.",
@@ -630,7 +628,6 @@ export function createSisyphusAgent(
     prompt,
     color: "#00CED1",
     permission,
-    tools: { call_omo_agent: false },
   }
 
   if (isGptModel(model)) {