build

Build the requested cmake preset (default debug, the day-to-day tree).

• pixi run build [preset] — configures (idempotent) and builds build/<preset>/ with the pixi toolchain (reproducible; never use the system compiler). Presets are defined in CMakePresets.json; dependency sources are shared across presets via .cache/cpm.
• Deleting a stale tree and rebuilding is always safe — rm -rf build/<preset> and rerun; presets make configuration reproducible.

On failure:

• Mechanical breakage (missing include, renamed symbol, stale call site after an agreed-on change): fix it, rebuild, and list every file you touched in the report.
• Design-level errors (the fix requires a decision): do not guess — report the error with file:line and the relevant excerpt.

Report back: preset, success or failure, files changed (if any), and for failures a digested error list — never the raw compiler spew.