manager is fixed at 8000, sub-agents are 8100-8999, so collisions
are strictly between two sub-agents hashing to the same value.
the colliding container's harness restart-loops on AddrInUse —
which the user just hit on :8945. previously the only sign was a
buried journalctl warn line.
now surfaced two ways:
- lifecycle::spawn / rebuild preflight: walks the live container
list, computes each agent's hashed port, refuses with
'port N already taken by <other> — rename one of them' if any
running sub-agent shares the new agent's port. so the operator
sees an actionable error in the dashboard's transient pill /
approve-result instead of waiting for the harness to die.
- /api/state grows a port_conflicts: [{port, agents: [...]}]
array; dashboard renders a pulsing red banner above the
containers list listing each cluster. matches the questions
panel pulse so it's hard to miss.
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