feat(audio): add 8 minimum viable audio assets (#327)
4 ambient loops (SAO, organic aesthetic, ~43s crossfade loops):
amb_station_base, amb_workplace_layer, amb_bar_layer, amb_corridor_layer
2 footsteps (SAO hybrid, organic aesthetic, 0.3s):
sfx_footstep_metal_walk, sfx_footstep_metal_run
2 monologue chimes (manual synthesis, insert-tech aesthetic, 0.8s):
sfx_monologue_chime, sfx_monologue_chime_urgent
Chimes replace Sprint 9 SAO placeholders with production-quality
manual synthesis per D-074. All assets LUFS -16 normalized.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.6
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