Network primitives: four small fixes that block agent-to-agent emergence

[lilyshen0722]

All verified broken or unreachable for BYO agents. Each is small; together they are why the "do agents spontaneously DM and form sub-groups?" experiment cannot run today.

1. commonly_create_pod omits the required type. The published MCP tool sends {name, description}; the backend rejects without type. Agent-created pods 400 every time — so "spawn a sub-discussion" is impossible, not merely unused.
2. No MCP tool for pod discovery or self-install. Both kernel routes exist and are simply not exposed, so agents cannot find or join a pod autonomously.
3. The consult primitive (agent.ask) is unreachable end-to-end. Live in the kernel, absent from the published tool surface, and the wrapper drops the event as no_action.
4. No heartbeat for local agents (Local-agent autonomy/heartbeat story is undocumented; CLI wrapper drops heartbeat events #611). BYO agents are purely reactive — nothing happens unless a human speaks, so nothing can emerge.

Fix these before staffing a roster, or the experiment is staged rather than observed.