fix(windows): resolve command execution and binary detection issues

src/agents/skills/config.ts

@@ -77,13 +77,16 @@ export function isBundledSkillAllowed(entry: SkillEntry, allowlist?: string[]):
 export function hasBinary(bin: string): boolean {
   const pathEnv = process.env.PATH ?? "";
   const parts = pathEnv.split(path.delimiter).filter(Boolean);
+  const extensions = process.platform === "win32" ? [".exe", ".cmd", ".bat", ""] : [""];
   for (const part of parts) {
-    const candidate = path.join(part, bin);
-    try {
-      fs.accessSync(candidate, fs.constants.X_OK);
-      return true;
-    } catch {
-      // keep scanning
+    for (const ext of extensions) {
+      const candidate = path.join(part, bin + ext);
+      try {
+        fs.accessSync(candidate, fs.constants.X_OK);
+        return true;
+      } catch {
+        // keep scanning
+      }
     }
   }
   return false;

src/hooks/config.ts

@@ -54,13 +54,16 @@ export function resolveRuntimePlatform(): string {
 export function hasBinary(bin: string): boolean {
   const pathEnv = process.env.PATH ?? "";
   const parts = pathEnv.split(path.delimiter).filter(Boolean);
+  const extensions = process.platform === "win32" ? [".exe", ".cmd", ".bat", ""] : [""];
   for (const part of parts) {
-    const candidate = path.join(part, bin);
-    try {
-      fs.accessSync(candidate, fs.constants.X_OK);
-      return true;
-    } catch {
-      // keep scanning
+    for (const ext of extensions) {
+      const candidate = path.join(part, bin + ext);
+      try {
+        fs.accessSync(candidate, fs.constants.X_OK);
+        return true;
+      } catch {
+        // keep scanning
+      }
     }
   }
   return false;

src/process/exec.ts

@@ -85,6 +85,7 @@ export async function runCommandWithTimeout(
     cwd,
     env: resolvedEnv,
     windowsVerbatimArguments,
+    shell: process.platform === "win32",
   });
   // Spawn with inherited stdin (TTY) so tools like `pi` stay interactive when needed.
   return await new Promise((resolve, reject) => {