feat(sshd-setup): multi-distro support and verification steps

- sshd-setup.sh: Auto-detect OS (Debian/Ubuntu/Fedora/RHEL/CentOS)
- Use appropriate package manager (apt-get vs dnf)
- Add verification steps after each major phase
- Exit with error if sshd installation fails
- Exit with error if sshd doesn't start successfully
- Add troubleshooting section in output

- kugetsu-install.sh: Add verification that kugetsu binary exists

- kugetsu-setup.md: Document multi-distro installation commands

docs/kugetsu-setup.md

@@ -26,16 +26,23 @@ This guide covers setting up a server/container with kugetsu for remote agent in
 ### Incus
 
 ```bash
-# Create container
+# Create container (Debian/Ubuntu)
 incus launch images:debian/12 <container-name>
 
+# Or create Fedora container
+incus launch images:fedora/43 <container-name>
+
 # Or use an existing container
 incus exec <container-name> -- bash
 
-# Ensure systemd is installed (Debian/Ubuntu)
+# Ensure systemd is installed
+# For Debian/Ubuntu:
 incus exec <container-name> -- apt-get update
 incus exec <container-name> -- apt-get install -y systemd
 
+# For Fedora:
+incus exec <container-name> -- dnf install -y systemd
+
 # Enable systemd in container (Incus specific - verify with your setup)
 incus config set <container-name> security.syscalls.intercept.systemd true
 
@@ -57,16 +64,33 @@ bash skills/kugetsu/scripts/sshd-setup.sh <username>
 
 Replace `<username>` with your preferred username, or omit to use default `kugetsu`.
 
+**The script automatically detects your OS and installs the correct packages.**
+
+Supported OSes: Debian, Ubuntu, Fedora, RHEL, CentOS
+
 ### Manual Setup
 
 If you prefer to set up SSH manually:
 
 #### 1. Install openssh-server
 
+**Debian/Ubuntu:**
 ```bash
 apt-get update && apt-get install -y openssh-server sudo
 ```
 
+**Fedora/RHEL/CentOS:**
+```bash
+dnf install -y openssh-server sudo
+```
+
+#### 2. Verify installation
+
+```bash
+which sshd
+sshd -V
+```
+
 #### 2. Create non-root user
 
 ```bash