fix(mcp): self-exit after idle timeout (prototype for #633)#634
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Some MCP clients (e.g. Claude Code) spawn fff-mcp per session but don't close stdin on session end, leaving orphan processes consuming CPU (#633, #497). Add an idle watchdog: each tool call bumps a last-activity timestamp, a background task ticks every 60s and exits(0) after --idle-timeout-secs (default 900) without activity. Set to 0 to disable. Also configurable via FFF_MCP_IDLE_TIMEOUT_SECS. Stopgap before the daemon-based process model. Notifications/pings do not count as activity, so a chatty-but-dead client cannot keep the process alive forever.
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closes #633
closes #497