* fix: wire auto_install_agent_deps into server.py startup; add api/startup.py to ARCHITECTURE.md
* fix(tests): kill stale process on test port before server start in conftest
Stale servers left by QA harness runs (ports 8792/8793 etc.) or prior
test sessions could interfere with conftest starting its own server on
TEST_PORT (8788). If the port was already occupied, _wait_for_server
hit the wrong server and tests got unexpected 404s/500s, failing
non-deterministically — the 'conftest isolation issue' seen this session.
Fix: run fuser -k on TEST_PORT before launching the new server process,
with a 0.5s sleep for port release. The full suite now runs 571/571
reliably regardless of what other servers were previously active.
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Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>
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