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.

.github/workflows/ci.yml

@@ -173,6 +173,23 @@ jobs:
           }
         shell: pwsh
 
+      - name: Test daemon lifecycle (open, snapshot, close)
+        run: |
+          $env:PATH = "$pwd\bin;$env:PATH"
+          Write-Host "--- Opening page ---"
+          bin/agent-browser-win32-x64.exe open https://example.com
+          if ($LASTEXITCODE -ne 0) { Write-Error "open failed"; exit 1 }
+          Write-Host "--- Taking snapshot ---"
+          $snapshot = bin/agent-browser-win32-x64.exe snapshot
+          if ($LASTEXITCODE -ne 0) { Write-Error "snapshot failed"; exit 1 }
+          Write-Host $snapshot
+          Write-Host "--- Closing browser ---"
+          bin/agent-browser-win32-x64.exe close
+          if ($LASTEXITCODE -ne 0) { Write-Error "close failed"; exit 1 }
+          Write-Host "--- Windows daemon lifecycle test passed ---"
+        shell: pwsh
+        timeout-minutes: 5
+
   serverless-chromium:
     name: Serverless Chromium (@sparticuz/chromium)
     runs-on: ubuntu-latest