Add probo-agent binary, installer, and CI

Signed-off-by: Ludovic Vielle <ludovic@probo.com>

cmd/probo-agent/installer/windows/register-protocol.ps1

@@ -0,0 +1,32 @@
+# Copyright (c) 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.
+
+[CmdletBinding()]
+param(
+    [string]$AgentPath = "$env:ProgramFiles\Probo\probo-agent.exe"
+)
+
+if (-not (Test-Path -LiteralPath $AgentPath)) {
+    throw "probo-agent executable not found at $AgentPath"
+}
+
+$protocolRoot = "HKCU:\Software\Classes\probo"
+$commandRoot = Join-Path $protocolRoot "shell\open\command"
+
+New-Item -Path $commandRoot -Force | Out-Null
+Set-ItemProperty -Path $protocolRoot -Name "(Default)" -Value "URL:Probo Enrollment Protocol"
+Set-ItemProperty -Path $protocolRoot -Name "URL Protocol" -Value ""
+Set-ItemProperty -Path $commandRoot -Name "(Default)" -Value "`"$AgentPath`" `"%1`""
+
+Write-Host "Registered probo:// protocol for current user."