The logger kept warnings in memory and wrote to a file only after Help
▸ Enable Logging, and it ignored RUST_LOG. An app that never opens its
window (macOS 27 on Apple Silicon, #234) therefore left no trace. Now
RUST_LOG (a level, or env_logger-style `target=level` directives)
also prints what it lets through to stderr, including eframe, winit
and wgpu. The desktop app logs its start-up milestones: opening the
window, the graphics adapter, the app created, the first frame drawn,
the window being asked to close, and the window closed.
Test: rust_log_filters_by_level_and_target (engine logging). Checked
by running the app with RUST_LOG=info and quitting it over the control
channel.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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