Add probo-agent CLI and deviceagent library

Introduce the standalone device agent binary and shared library
for enrollment, posture checks, self-update, and OS service
integration. Include build targets, module deps, and release
workflow so the agent can ship independently of server changes.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/deviceagent/checks/runcmd_paths_freebsd.go

@@ -0,0 +1,29 @@
+// Copyright (c) 2025-2026 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package checks
+
+var freeBSDCommandPaths = map[string][]string{
+	"clamd":                {"/usr/local/sbin/clamd", "/usr/sbin/clamd"},
+	"clamdscan":            {"/usr/local/bin/clamdscan", "/usr/bin/clamdscan"},
+	"geli":                 {"/sbin/geli"},
+	"pfctl":                {"/sbin/pfctl"},
+	"service":              {"/usr/sbin/service"},
+	"uname":                {"/usr/bin/uname"},
+	"xscreensaver-command": {"/usr/local/bin/xscreensaver-command"},
+}
+
+func commandCandidates(cmd string) []string {
+	return freeBSDCommandPaths[cmd]
+}