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/tools/index.ts

@@ -1,4 +1,7 @@
 import {
+  lsp_goto_definition,
+  lsp_find_references,
+  lsp_symbols,
   lsp_diagnostics,
   lsp_prepare_rename,
   lsp_rename,
@@ -52,6 +55,9 @@ export function createBackgroundTools(manager: BackgroundManager, client: Openco
 }
 
 export const builtinTools: Record<string, ToolDefinition> = {
+  lsp_goto_definition,
+  lsp_find_references,
+  lsp_symbols,
   lsp_diagnostics,
   lsp_prepare_rename,
   lsp_rename,