Update flake.lock to get latest packages within the current NixOS release - runs nix flake update, checks build, and optionally applies

This skill upgrades NixOS to a new release version (e.g., 25.05 → 25.11). Triggers: "upgrade nixos", "upgrade to new release", "update nixos version", "move to nixos 25.11", "nixos release upgrade", "upgrade system version". Researches breaking changes, updates flake inputs, guides through upgrade. Not for flake.lock updates within same release (use upgrade-flake for that).

This skill captures and analyzes tmux pane content for debugging. Triggers: "debug tmux", "capture tmux output", "check other session", "tmux pane content", "what's in that terminal", "inspect background process", "tmux scrollback". Captures screen content from tmux panes to debug sessions or monitor processes.