wiki: add WSL OpenSSH default shell + Ansible world-writable mount articles

Two new troubleshooting articles from today's MajorRig/MajorMac Ansible setup:
- Windows OpenSSH WSL default shell breaks remote SSH commands
- Ansible silently ignores ansible.cfg on WSL2 world-writable mounts

Article count: 76

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

05-troubleshooting/networking/windows-openssh-wsl-default-shell-breaks-remote-commands.md

@@ -0,0 +1,69 @@
+---
+title: "Windows OpenSSH: WSL as Default Shell Breaks Remote Commands"
+domain: troubleshooting
+category: networking
+tags: [windows, openssh, wsl, ssh, majorrig, powershell]
+status: published
+created: 2026-04-03
+updated: 2026-04-03
+---
+
+# Windows OpenSSH: WSL as Default Shell Breaks Remote Commands
+
+## Problem
+
+SSH remote commands fail with:
+
+```
+Invalid command line argument: -c
+Please use 'wsl.exe --help' to get a list of supported arguments.
+```
+
+This happens on **every** remote command — `ssh-copy-id`, `ssh user@host "command"`, `scp`, etc. Interactive SSH (no command) may still work if it drops into WSL.
+
+## Cause
+
+Windows OpenSSH's default shell is set to `C:\Windows\System32\wsl.exe`. When SSH executes a remote command, it invokes:
+
+```
+<default_shell> -c "<command>"
+```
+
+But `wsl.exe` does not accept the `-c` flag. It expects `-e` for command execution, or no flags for an interactive session. Since OpenSSH hardcodes `-c`, every remote command fails.
+
+## Fix
+
+Change the default shell to PowerShell. Run this in an **elevated PowerShell** on the Windows host:
+
+```powershell
+New-ItemProperty -Path "HKLM:\SOFTWARE\OpenSSH" -Name DefaultShell -Value "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -PropertyType String -Force
+Restart-Service sshd
+```
+
+If you need to run this from within WSL (e.g., over an interactive SSH session):
+
+```bash
+powershell.exe -Command "Start-Process powershell -Verb RunAs -ArgumentList '-Command New-ItemProperty -Path HKLM:\\SOFTWARE\\OpenSSH -Name DefaultShell -Value C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe -PropertyType String -Force; Restart-Service sshd'"
+```
+
+## After the Fix
+
+- Remote SSH commands now execute via PowerShell
+- To run Linux commands, prefix with `wsl`:
+  ```bash
+  ssh user@host "wsl bash -c 'cd /mnt/d/project && git pull'"
+  ```
+- Interactive SSH sessions land in PowerShell (use `wsl` to enter Linux)
+- `ssh-copy-id` still won't work for WSL's `authorized_keys` — Windows OpenSSH reads from `C:\Users\<user>\.ssh\authorized_keys`, not the WSL home directory
+
+## Key Notes
+
+- This registry key is the **only** supported way to change the OpenSSH default shell on Windows
+- The change persists across reboots and Windows Updates
+- If you previously set the default shell to `wsl.exe` to get a Linux-first SSH experience, be aware that it permanently breaks all remote command execution
+- Tools like Ansible, `scp`, `rsync`, and `ssh-copy-id` all depend on `-c` working
+
+## Related
+
+- [Windows OpenSSH Server (sshd) Stops After Reboot](windows-sshd-stops-after-reboot.md) — sshd service startup issues
+- [Microsoft Docs: OpenSSH DefaultShell](https://learn.microsoft.com/en-us/windows-server/administration/openssh/openssh-server-configuration#configuring-the-default-shell-for-openssh-in-windows)