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/sessions-cli.js

@@ -1,6 +1,7 @@
 #!/usr/bin/env node
 'use strict';
 
+const os = require('os');
 const { createStateStore } = require('./lib/state-store');
 
 function showHelp(exitCode = 0) {
@@ -134,7 +135,7 @@ async function main() {
 
     store = await createStateStore({
       dbPath: options.dbPath,
-      homeDir: process.env.HOME,
+      homeDir: process.env.HOME || os.homedir(),
     });
 
     if (!options.sessionId) {