Both were found by following RUNNING.md on this host from a clean checkout, and
both fail in a way that blames the wrong thing.
`godot --path port` without a prior `--import` produces THIRTY parse errors
naming half the project -- ScreenView, MenuAudio, Gamepad, MenuFlow, ExportTree
all "not declared", each cascading into "cannot infer the type of ..." -- and
then hangs. That reads like a port that does not compile. It is one gitignored
file: `port/.godot/global_script_class_cache.cfg`, which Godot writes at import
time and which `class_name` resolution needs. After `--headless --path port
--import`: zero errors, `main_menu` loads 16 elements and settles at t=56.
The exporter shells out to ffmpeg and ffprobe for the movies AND the audio, and
`sylph-ci:local` has neither -- so the documented `cargo run` fails minutes in,
after the screens are already written and it looks like it is working. The image
to use is `sylph-ci:ffmpeg`.
Neither bites in the agent container: its image carries an imported tree and its
own ffmpeg. That is exactly why neither was ever written down.
Also recorded: `--headless` CANNOT `--capture` (the dummy renderer never emits
`frame_post_draw`; the port detects this and says so), and `xvfb-run`, which its
message suggests, is not installed on every host -- it is not on this one.
Measured 2026-09-26 on fabi-Hyrican-PC: 31 s build, 4 min 11 s export, 149 MB,
`sylpheed-export check` validates all 16 screens against sylpheed.screen/3.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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