fix: honor control-plane-assigned PORT instead of hardcoding 8003

[AbirAbbas]

Summary

main() — the python -m swe_af / swe-af entry point — called app.run(port=8003, host="0.0.0.0"). Under af run, the AgentField control plane assigns a free port per launch, exports it as the PORT env var, and polls readiness on that port. The hardcoded 8003 made the process bind the wrong port, so the readiness poll never succeeded:

✅ Assigned port: 8001
📡 Starting agent node process...
❌ Failed to run agent: agent node failed to start: agent node did not become ready within 10s

The agent had actually started fine — just on 8003 instead of the assigned 8001 — so the control plane killed it as unready. This blocks af run swe-planner for everyone installing SWE-AF as an agent node.

Fix

Drop the explicit port:

app.run(host="0.0.0.0")

The SDK's Agent.run() reads PORT from the env when no port is passed (the control-plane integration path), and auto-selects a free port when run standalone. Verified end-to-end: after the change, af run swe-planner binds the assigned port and passes readiness.

Test

tests/test_main_entrypoint.py — contract test asserting main() never passes an explicit port to app.run() (mocks app.run, checks no positional/port= arg). compileall clean.

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