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Two Godot --script-mode-only quirks, neither a bug in ApiClient itself (verified working against a real backend, health_check returns 200): 1. Bare autoload identifiers don't resolve at compile time in --script/ SceneTree runs (the node exists at runtime, root.has_node() is true, but referencing it as a plain global name fails to compile) -- use get_node() instead. 2. A freshly add_child()'d HTTPRequest isn't reliably "inside tree" yet at _initialize() time, since --script mode hasn't processed a frame yet -- one process_frame await fixes it. Verified: full smoke test now passes end-to-end against a live backend (docker compose postgres + alembic migrations + uvicorn), confirming ApiClient.health_check() genuinely round-trips. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>