Replace scattered VRAM-based if/else chains with a declarative TOML profile system. GPU profiles (rtx3050, a100, h100, default) are selected by device name and embedded at compile time via include_str! for zero-filesystem fallback in CI/containers, with filesystem and env var overrides. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>