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Implements DEMO_HEADLESS build option for fast iteration cycles:
- Functional GPU/platform stubs (not pure no-ops like STRIP_EXTERNAL_LIBS)
- Audio and timeline systems work normally
- No rendering overhead
- Useful for CI, audio development, timeline validation
Files added:
- doc/HEADLESS_MODE.md - Documentation
- src/gpu/headless_gpu.cc - Validated GPU stubs
- src/platform/headless_platform.cc - Time simulation (60Hz)
- scripts/test_headless.sh - End-to-end test script
Usage:
cmake -B build_headless -DDEMO_HEADLESS=ON
cmake --build build_headless -j4
./build_headless/demo64k --headless --duration 30
Progress printed every 5s. Compatible with --dump_wav mode.
handoff(Claude): Task #76 follow-up - headless mode complete
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