fix(daemon): include user bin dirs in macOS LaunchAgent PATH

The LaunchAgent plist was missing user bin directories on macOS, causing
skills that depend on binaries installed via volta, pnpm, bun, cargo, etc.
to show as 'blocked' in the UI.

Changes:
- Rename resolveLinuxUserBinDirs → resolvePosixUserBinDirs
- Apply user bin dir resolution for both 'linux' and 'darwin' platforms
- Add macOS-specific pnpm path (~/Library/pnpm)
- Add cargo bin path (~/.cargo/bin)

Fixes #4699

src/daemon/service-env.ts

@@ -36,10 +36,10 @@ function resolveSystemPathDirs(platform: NodeJS.Platform): string[] {
 }
 
 /**
- * Resolve common user bin directories for Linux.
+ * Resolve common user bin directories for POSIX systems (Linux and macOS).
  * These are paths where npm global installs and node version managers typically place binaries.
  */
-export function resolveLinuxUserBinDirs(
+export function resolvePosixUserBinDirs(
   home: string | undefined,
   env?: Record<string, string | undefined>,
 ): string[] {
@@ -74,8 +74,10 @@ export function resolveLinuxUserBinDirs(
   dirs.push(`${home}/.fnm/current/bin`); // fnm
   dirs.push(`${home}/.volta/bin`); // Volta
   dirs.push(`${home}/.asdf/shims`); // asdf
-  dirs.push(`${home}/.local/share/pnpm`); // pnpm global bin
+  dirs.push(`${home}/.local/share/pnpm`); // pnpm global bin (Linux)
+  dirs.push(`${home}/Library/pnpm`); // pnpm global bin (macOS)
   dirs.push(`${home}/.bun/bin`); // Bun
+  dirs.push(`${home}/.cargo/bin`); // Rust/Cargo
 
   return dirs;
 }
@@ -88,9 +90,11 @@ export function getMinimalServicePathParts(options: MinimalServicePathOptions =
   const extraDirs = options.extraDirs ?? [];
   const systemDirs = resolveSystemPathDirs(platform);
 
-  // Add Linux user bin directories (npm global, nvm, fnm, volta, etc.)
-  const linuxUserDirs =
-    platform === "linux" ? resolveLinuxUserBinDirs(options.home, options.env) : [];
+  // Add user bin directories for POSIX systems (npm global, nvm, fnm, volta, pnpm, bun, etc.)
+  const posixUserDirs =
+    platform === "linux" || platform === "darwin"
+      ? resolvePosixUserBinDirs(options.home, options.env)
+      : [];
 
   const add = (dir: string) => {
     if (!dir) return;
@@ -99,7 +103,7 @@ export function getMinimalServicePathParts(options: MinimalServicePathOptions =
 
   for (const dir of extraDirs) add(dir);
   // User dirs first so user-installed binaries take precedence
-  for (const dir of linuxUserDirs) add(dir);
+  for (const dir of posixUserDirs) add(dir);
   for (const dir of systemDirs) add(dir);
 
   return parts;