feat(ai-term): wrap-teardown + shutdown entry points for rulesets

Add the three headless functions the rulesets wrap-it-up workflow calls via emacsclient -e, since this module owns the aiv- session naming, the agent buffer, and the geometry restore. cj/ai-term-quit kills a project's tmux session and agent buffer and restores the layout, idempotent and safe when already gone. cj/ai-term-live-count returns the integer count of live aiv- sessions for the shutdown safety gate. cj/ai-term-shutdown-countdown re-checks that gate, then runs an abort-able run-at-time countdown in the echo area and, uncancelled, runs the shutdown command (a defcustom so tests stub it). Reuses the existing kill/close helpers. 13 ERT tests cover the live-count parsing, the quit kill-and-idempotency, and the gate-abort/cancel/tick logic; the tmux and shutdown side effects are manual.

Claude-Session: https://claude.ai/code/session_01BqrdWUo9GcznYX2pZr76gZ

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