feat: Windows native support via Git Bash

- Add scripts/install.cmd batch wrapper for CMD users (delegates to install.ps1)
- Add _find_shell() in local.py: detects Git Bash on Windows via
  HERMES_GIT_BASH_PATH env var, shutil.which, or common install paths
  (same pattern as Claude Code's CLAUDE_CODE_GIT_BASH_PATH)
- Use _find_shell() in process_registry.py for background processes
- Fix hermes_cli/gateway.py: use wmic instead of ps aux on Windows,
  skip SIGKILL (doesn't exist on Windows), fix venv path
  (Scripts/python.exe vs bin/python)
- Update README with three install commands (Linux/macOS, PowerShell, CMD)
  and Windows native documentation

Requires Git for Windows, which bundles bash.exe. The terminal tool
transparently uses Git Bash for shell commands regardless of whether
the user launched hermes from PowerShell or CMD.

hermes_cli/gateway.py

@@ -21,39 +21,59 @@ PROJECT_ROOT = Path(__file__).parent.parent.resolve()
 def find_gateway_pids() -> list:
     """Find PIDs of running gateway processes."""
     pids = []
+    patterns = [
+        "hermes_cli.main gateway",
+        "hermes gateway",
+        "gateway/run.py",
+    ]
+
     try:
-        # Look for gateway processes with multiple patterns
-        patterns = [
-            "hermes_cli.main gateway",
-            "hermes gateway",
-            "gateway/run.py",
-        ]
-        
-        result = subprocess.run(
-            ["ps", "aux"],
-            capture_output=True,
-            text=True
-        )
-        
-        for line in result.stdout.split('\n'):
-            # Skip grep and current process
-            if 'grep' in line or str(os.getpid()) in line:
-                continue
-            
-            for pattern in patterns:
-                if pattern in line:
-                    parts = line.split()
-                    if len(parts) > 1:
+        if is_windows():
+            # Windows: use wmic to search command lines
+            result = subprocess.run(
+                ["wmic", "process", "get", "ProcessId,CommandLine", "/FORMAT:LIST"],
+                capture_output=True, text=True
+            )
+            # Parse WMIC LIST output: blocks of "CommandLine=...\nProcessId=...\n"
+            current_cmd = ""
+            for line in result.stdout.split('\n'):
+                line = line.strip()
+                if line.startswith("CommandLine="):
+                    current_cmd = line[len("CommandLine="):]
+                elif line.startswith("ProcessId="):
+                    pid_str = line[len("ProcessId="):]
+                    if any(p in current_cmd for p in patterns):
                         try:
-                            pid = int(parts[1])
-                            if pid not in pids:
+                            pid = int(pid_str)
+                            if pid != os.getpid() and pid not in pids:
                                 pids.append(pid)
                         except ValueError:
-                            continue
-                    break
+                            pass
+                    current_cmd = ""
+        else:
+            result = subprocess.run(
+                ["ps", "aux"],
+                capture_output=True,
+                text=True
+            )
+            for line in result.stdout.split('\n'):
+                # Skip grep and current process
+                if 'grep' in line or str(os.getpid()) in line:
+                    continue
+                for pattern in patterns:
+                    if pattern in line:
+                        parts = line.split()
+                        if len(parts) > 1:
+                            try:
+                                pid = int(parts[1])
+                                if pid not in pids:
+                                    pids.append(pid)
+                            except ValueError:
+                                continue
+                        break
     except Exception:
         pass
-    
+
     return pids
 
 
@@ -64,7 +84,7 @@ def kill_gateway_processes(force: bool = False) -> int:
     
     for pid in pids:
         try:
-            if force:
+            if force and not is_windows():
                 os.kill(pid, signal.SIGKILL)
             else:
                 os.kill(pid, signal.SIGTERM)
@@ -102,7 +122,10 @@ def get_launchd_plist_path() -> Path:
     return Path.home() / "Library" / "LaunchAgents" / "ai.hermes.gateway.plist"
 
 def get_python_path() -> str:
-    venv_python = PROJECT_ROOT / "venv" / "bin" / "python"
+    if is_windows():
+        venv_python = PROJECT_ROOT / "venv" / "Scripts" / "python.exe"
+    else:
+        venv_python = PROJECT_ROOT / "venv" / "bin" / "python"
     if venv_python.exists():
         return str(venv_python)
     return sys.executable