fix(tools): use pnpm update for global self updates

changelog.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## Pending
+
+### Fixes
+
+- make global tool self-updates verify and use pnpm's update path
+  - Uses `pnpm update -g <package> --latest` before falling back to install for latest-version updates.
+  - Verifies installed package versions through `pnpm list -g` so pnpm v11 hash roots are handled correctly.
+
 ## 2026-06-05 - 2.19.6
 
 ### Fixes

ts/mod_tools/classes.packagemanager.ts

@@ -425,14 +425,48 @@ export class PackageManagerUtil {
       return false;
     }
 
-    const packageSpecifier = `${packageName}@${version}`;
-    console.log(`  Installing ${packageSpecifier} via pnpm...`);
+    let effectiveVersion = version;
+    if (version === "latest") {
+      const latestVersion = await this.getLatestMatureVersion(packageName);
+      console.log(`  Updating ${packageName} via pnpm...`);
+      try {
+        const updateResult = await this.shell.exec(
+          `${pnpmCommand} update -g ${shellQuote(packageName)} --latest`,
+        );
+        const installedVersion = await this.getCurrentInstalledPackageVersion(
+          packageName,
+        );
+        if (
+          updateResult.exitCode === 0 &&
+          installedVersion &&
+          (!latestVersion || installedVersion === latestVersion)
+        ) {
+          return true;
+        }
+      } catch {
+        // Missing globals need an add instead of update.
+      }
 
+      effectiveVersion = latestVersion || version;
+    }
+
+    const packageSpecifier = `${packageName}@${effectiveVersion}`;
+    console.log(`  Installing ${packageSpecifier} via pnpm...`);
     try {
       const result = await this.shell.exec(
         `${pnpmCommand} add -g ${shellQuote(packageSpecifier)}`,
       );
-      return result.exitCode === 0;
+      if (result.exitCode !== 0) {
+        return false;
+      }
+      if (effectiveVersion === "latest") {
+        return true;
+      }
+
+      const installedVersion = await this.getCurrentInstalledPackageVersion(
+        packageName,
+      );
+      return installedVersion === effectiveVersion;
     } catch {
       return false;
     }
@@ -636,6 +670,15 @@ export class PackageManagerUtil {
     return Array.from(packageMap.values());
   }
 
+  private async getCurrentInstalledPackageVersion(
+    packageName: string,
+  ): Promise<string | null> {
+    const installedPackage = (await this.getCurrentInstalledPackages()).find(
+      (packageInfo) => packageInfo.name === packageName,
+    );
+    return installedPackage?.version || null;
+  }
+
   private async inspectGlobalRoot(
     globalDir: string,
     current: boolean,

ts/mod_tools/index.ts

@@ -328,7 +328,7 @@ async function handleSelfUpdate(
     return false;
   }
 
-  const success = await pmUtil.installLatest("@git.zone/cli", latestVersion);
+  const success = await pmUtil.installLatest("@git.zone/cli");
   if (!success) {
     console.log(
       "\ngitzone self-update failed. Continuing with the current version.\n",