Add native Windows host daemon (bleak/WinRT)

Adds a Windows port of the host daemon so the Clawdmeter stays connected
on Windows independent of WSL. Mirrors the macOS daemon and speaks the
existing GATT data service unchanged — no firmware changes.

- claude_usage_daemon_windows.py: Windows-local OAuth token read +
  Anthropic poll + BLE scan/connect/write, with auto-reconnect
  (connect-retry wrapper, zombie-link break, split fast/slow backoff)
- tray_windows.py: pystray login-startup tray app (status icon + Quit)
- autostart_windows.py: winreg HKCU\Run autostart via pythonw.exe
- icon_assets.py: per-state tray icons composited from logo.h
- install-windows.ps1 + daemon/README-windows.md: turnkey setup
- pytest suite: token / poll / reconnect / tray / autostart / no-WSL guard

daemon/tests/test_windows_no_wsl.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python3
+"""Static no-WSL-paths regression guard — APP-02 / D-10.
+
+Asserts that the daemon, tray, and autostart sources reference no WSL-specific
+paths.  This is a CI-surviving regression lock that needs no hardware: if a
+future edit accidentally introduces a ``\\wsl$``, ``wsl.exe``, ``/home/``, or
+``/mnt/`` reference into any of the three core Windows daemon source files, this
+test will fail with a message that names the offending pattern and file.
+
+Run: python -m pytest daemon/tests/test_windows_no_wsl.py -x -q
+"""
+import re
+from pathlib import Path
+
+# The four WSL-path patterns that must never appear in the daemon sources.
+FORBIDDEN = [r"\\wsl\$", r"wsl\.exe", r"/home/", r"/mnt/"]
+
+# The three Windows-daemon source files covered by the guard.
+SOURCES = [
+    Path("daemon/claude_usage_daemon_windows.py"),
+    Path("daemon/tray_windows.py"),
+    Path("daemon/autostart_windows.py"),
+]
+
+
+def test_no_wsl_paths_in_daemon():
+    """daemon/claude_usage_daemon_windows.py references no WSL paths."""
+    _assert_clean(Path("daemon/claude_usage_daemon_windows.py"))
+
+
+def test_no_wsl_paths_in_tray():
+    """daemon/tray_windows.py references no WSL paths."""
+    _assert_clean(Path("daemon/tray_windows.py"))
+
+
+def test_no_wsl_paths_in_autostart():
+    """daemon/autostart_windows.py references no WSL paths."""
+    _assert_clean(Path("daemon/autostart_windows.py"))
+
+
+def _assert_clean(source: Path) -> None:
+    """Assert that none of the FORBIDDEN patterns appear in the given source file.
+
+    Reads the file relative to the repository root (the cwd pytest is invoked
+    from).  Fails with a descriptive message naming the leaked pattern and file
+    so the regression is immediately actionable.
+    """
+    text = source.read_text(encoding="utf-8")
+    for pat in FORBIDDEN:
+        match = re.search(pat, text)
+        assert match is None, (
+            f"WSL path leaked into {source}: pattern {pat!r} found at "
+            f"position {match.start()} — "
+            f"context: {text[max(0, match.start()-20):match.end()+20]!r}"
+        )