deadman chip: show the armed dead man's switch countdown

[lroolle]

thevibeworks/deadman v0.2.0 ships a statusline contract: deadman chip <session-id> prints armed 42m, warned 3m, or nothing (PID-checked, one file read from $TMPDIR/deadman/.meta).

Proposal: a session-identity chip next to the cctrace one (statusline.sh ~3118 pattern) — dim while armed, amber once warned:

# deadman chip: is a dead man's switch armed for this session?
build_deadman_chip() {
    command -v deadman >/dev/null 2>&1 || {
        [ -x "$HOME/.claude/deadman/bin/deadman" ] || return 0; }
    local dm
    dm="$("${DEADMAN_BIN:-deadman}" chip "$session_id" 2>/dev/null)"
    [ -n "$dm" ] || return 0
    case "$dm" in
        warned*) echo " ${YELLOW}[dm $dm]${RESET}" ;;
        *)       echo " ${DIM}[dm $dm]${RESET}" ;;
    esac
}

Why it fits: the switch is invisible between the Stop announce and the phone warn; the statusline is exactly where "something is counting down on this session" belongs. Cost is one subprocess + one file read, only when deadman is installed.

Happy to send the PR if the chip is wanted.

🤖 Generated with Claude Code