Previously, town-level session stopping (Mayor, Boot, Deacon) was
implemented inline in gt down with separate code blocks for each
session. The shutdown order (Boot must stop before Deacon to prevent
the watchdog from restarting Deacon) was implicit in the code ordering.
Add session.TownSessions() and session.StopTownSession() to centralize
town-level session management. This provides a single source of truth
for the session list, shutdown order, and graceful/force logic.
Refactor gt down to use these helpers instead of inline logic.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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