Add requestHeartbeatNow to PluginRuntime.system so extensions can
trigger an immediate heartbeat wake without importing internal modules.
This enables extensions to inject a system event and wake the agent
in one step — useful for inbound message handlers that use the
heartbeat model (e.g. agent-to-agent DMs via Nostr).
Changes:
- src/plugins/runtime/types.ts: add RequestHeartbeatNow type alias
and requestHeartbeatNow to PluginRuntime.system
- src/plugins/runtime/index.ts: import and wire requestHeartbeatNow
into createPluginRuntime()
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