fix(scripts): add os.homedir() fallback for Windows compatibility

On Windows (native cmd/PowerShell), process.env.HOME is undefined.
Seven CLI entry points and two library files pass process.env.HOME
directly as homeDir without a cross-platform fallback, causing all
path resolutions to silently fail (resolving to "undefined/.claude/...").

Node.js os.homedir() correctly handles all platforms (HOME on Unix,
USERPROFILE on Windows, OS-level fallback). The project already uses
this pattern in scripts/lib/state-store/index.js and has a getHomeDir()
utility in scripts/lib/utils.js, but it was not applied consistently.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Signed-off-by: Lidang-Jiang <lidangjiang@gmail.com>

scripts/list-installed.js

@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+const os = require('os');
 const { discoverInstalledStates } = require('./lib/install-lifecycle');
 const { SUPPORTED_INSTALL_TARGETS } = require('./lib/install-manifests');
 
@@ -70,7 +71,7 @@ function main() {
     }
 
     const records = discoverInstalledStates({
-      homeDir: process.env.HOME,
+      homeDir: process.env.HOME || os.homedir(),
       projectRoot: process.cwd(),
       targets: options.targets,
     }).filter(record => record.exists);