fix(windows): resolve daemon startup failures and Git Bash compatibility (#582)

* fix(windows): resolve daemon startup failures and Git Bash compatibility

Three root causes behind 27 open Windows issues:

1. Path::canonicalize() returns \\?\ prefixed paths on Windows that
   Node.js cannot parse, preventing daemon startup. Strip the prefix
   before passing to Node. (fixes #522, #390, #56, #25, #37, #89)

2. Git Bash/MSYS2 translates Unix-style paths and resolves node to
   a shell wrapper script. Use node.exe explicitly and set
   MSYS_NO_PATHCONV/MSYS2_ARG_CONV_EXCL to prevent argument mangling.
   (fixes #148, #108, #171)

3. postinstall fixWindowsShims() hardcoded x64 arch and did not verify
   the native binary exists before rewriting shims. Now detects arch
   dynamically and validates the binary path. (fixes #262)

Also:
- Error messages now show TCP port on Windows instead of Unix socket path
- Windows CI expanded to test full daemon lifecycle (open, snapshot, close)

* fix(windows): strip \\?\ prefix in auth-cli path (fixes #579)

Same canonicalize() issue as the daemon spawn path, but in
run_auth_cli() which passes the script path to Node.js.

cli/src/main.rs

@@ -31,6 +31,15 @@ use std::process::Command as ProcessCommand;
 fn run_auth_cli(cmd: &serde_json::Value, json_mode: bool) -> ! {
     let exe_path = env::current_exe().unwrap_or_default();
     let exe_path = exe_path.canonicalize().unwrap_or(exe_path);
+    #[cfg(windows)]
+    let exe_path = {
+        let p = exe_path.to_string_lossy();
+        if let Some(stripped) = p.strip_prefix(r"\\?\") {
+            PathBuf::from(stripped)
+        } else {
+            exe_path
+        }
+    };
     let exe_dir = exe_path.parent().unwrap_or(std::path::Path::new("."));
 
     let mut script_paths = vec![
@@ -233,6 +242,13 @@ fn main() {
         libc::signal(libc::SIGPIPE, libc::SIG_DFL);
     }
 
+    // Prevent MSYS/Git Bash path translation from mangling arguments
+    #[cfg(windows)]
+    {
+        env::set_var("MSYS_NO_PATHCONV", "1");
+        env::set_var("MSYS2_ARG_CONV_EXCL", "*");
+    }
+
     let args: Vec<String> = env::args().skip(1).collect();
     let flags = parse_flags(&args);
     let clean = clean_args(&args);