Fixing unit tests on windows (#813)

* Add Windows stub for orphan cleanup

* Fix account switch tests on Windows

* Make query session events test portable

* Disable beads daemon in query session events test

* Add Windows bd stubs for sling tests

* Make expandOutputPath test OS-agnostic

* Make role_agents test Windows-friendly

* Make config path tests OS-agnostic

* Make HealthCheckStateFile test OS-agnostic

* Skip orphan process check on Windows

* Normalize sparse checkout detail paths

* Make dog path tests OS-agnostic

* Fix bare repo refspec config on Windows

* Add Windows process detection for locks

* Add Windows CI workflow

* Make mail path tests OS-agnostic

* Skip plugin file mode test on Windows

* Skip tmux-dependent polecat tests on Windows

* Normalize polecat paths and AGENTS.md content

* Make beads init failure test Windows-friendly

* Skip rig agent bead init test on Windows

* Make XDG path tests OS-agnostic

* Make exec tests portable on Windows

* Adjust atomic write tests for Windows

* Make wisp tests Windows-friendly

* Make workspace find tests OS-agnostic

* Fix Windows rig add integration test

* Make sling var logging Windows-friendly

* Fix sling attached molecule update ordering

---------

Co-authored-by: Johann Dirry <johann.dirry@microsea.at>

internal/lock/process_unix.go

@@ -0,0 +1,25 @@
+//go:build !windows
+
+package lock
+
+import (
+	"os"
+	"syscall"
+)
+
+// processExists checks if a process with the given PID exists and is alive.
+func processExists(pid int) bool {
+	if pid <= 0 {
+		return false
+	}
+
+	// On Unix, sending signal 0 checks if process exists without affecting it.
+	process, err := os.FindProcess(pid)
+	if err != nil {
+		return false
+	}
+
+	// Try to send signal 0 - this will fail if process doesn't exist.
+	err = process.Signal(syscall.Signal(0))
+	return err == nil
+}