VS Code extension: Notification hooks not firing and no native VS Code notifications

Description

When using Claude Code through the VS Code extension, the Notification hook configured in ~/.claude/settings.json never fires. Additionally, the extension does not register as a VS Code notification source, so no native VS Code notifications are shown either.

The same hook works correctly when using Claude Code from the CLI.

Steps to Reproduce

1. Configure a Notification hook in ~/.claude/settings.json:

{
  "hooks": {
    "Notification": [
      {
        "matcher": "",
        "hooks": [
          {
            "type": "command",
            "command": "osascript -e 'display notification \"Claude needs attention\" with title \"Claude Code\" sound name \"default\"'"
          }
        ]
      }
    ]
  }
}

1. Use Claude Code from the CLI (claude command) — notification fires correctly
2. Use Claude Code from the VS Code extension — no notification at all

Additional Context

• The extension does not appear in VS Code's notification sources list (Settings > Notifications > Select sources), confirming it doesn't register as a notification provider
• Running the hook command manually via Bash from the extension context works fine — the issue is that the Notification event is never emitted
• macOS Sequoia, VS Code latest

Expected Behavior

• The Notification hook should fire from the VS Code extension just as it does from the CLI
• Ideally, the extension should also register as a VS Code notification source for native IDE notifications