mflux dev environment

This repo expects macOS arm64 and prefers uv + justfile recipes.

When to Use

• You’re setting up the repo locally or diagnosing environment/setup issues.
• You need the canonical way to run lint/format/check/build/test.

Instructions

• Prereq: just ≥ 1.50 (brew install just). CI lints the justfile with just --fmt --check; run just fmt-justfile to auto-fix formatting.
• Prefer justfile recipes:

- Install: just install - Lint: just lint - Format: just format - Pre-commit suite: just check - Build: just build

• Prefer uv run ... for running Python commands to ensure the correct environment.
• When running tests, keep MFLUXPRESERVETEST_OUTPUT=1 enabled (the justfile test recipes already do this).

Type checking (ty)

• The type checker is astral's ty, pinned exactly in pyproject.toml dev deps (mirrored in .pre-commit-config.yaml and run in CI). Run it with just typecheck (or uv run ty check).
• [tool.ty.rules] in pyproject.toml carries a one-time migration baseline (mypy → ty): every rule listed there had pre-existing violations and is set to "ignore", with violation counts in comments.
• Planned burn-down: we intend to re-enable these rules piecemeal — delete one ignore line, fix all resulting ty check errors, commit, repeat. Prefer starting with low-count rules. Do not add new ignore lines; new code must pass all rules not in the baseline.