v2.3.1 — First-run launcher prompt

✨ New

• 🪟🏠 First-run launcher prompt — the first time you run agentpulse, it asks whether you want a new window or in-place, then remembers your choice in ~/.config/agent-pulse/launcher.conf.
• --new-window flag added (explicit one-off opt-in, symmetric with --here)
• --reconfigure flag to forget the saved preference and prompt again

Behaviour

Situation	Result
First run, interactive	Asks 1/2, saves choice
First run, non-interactive (piped)	Defaults to new-window, writes no config
Subsequent runs	Reads config silently
--here / --new-window passed	One-off override; does not modify saved pref
--reconfigure	Wipes config, asks again