Give SSH commands the user-level tool paths (#6632)

* Give SSH commands the user-level tool paths

ssh host cmd runs neither a login nor an interactive shell, so on Arch it
gets the bare sshd PATH and can't find mise-managed tools like the agent
CLIs herdr scans for. Set PATH in the PAM environment (per-user via
@{HOME}), append the user-level dirs in env-bootstrap so login shells and
the uwsm session get them too, and source env-bootstrap before bashrc's
interactive guard for bash variants that read it non-interactively.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Don't let an empty PATH turn into a cwd entry

Appending with a bare "$PATH:" prefix leaves a leading colon when PATH
is unset, which shells treat as the current directory.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

default/bashrc

@@ -1,9 +1,11 @@
-# If not running interactively, don't do anything (leave this at the top of this file)
+# Omarchy environment (OMARCHY_PATH + PATH), needed even for non-interactive shells
+[[ -r /usr/share/omarchy/default/bash/env-bootstrap ]] && source /usr/share/omarchy/default/bash/env-bootstrap
+
+# If not running interactively, don't do anything else (leave this above the rc source)
 [[ $- != *i* ]] && return
 
 # All the default Omarchy aliases and functions
 # (don't mess with these directly, just overwrite them here!)
-[[ -r /usr/share/omarchy/default/bash/env-bootstrap ]] && source /usr/share/omarchy/default/bash/env-bootstrap
 source "$OMARCHY_PATH/default/bash/rc"
 
 # Add your own exports, aliases, and functions here.