elixir-cyclic-deps

# Elixir Cyclic Dependencies ## When to Use Apply this skill only when the user **explicitly asks** to check or remove cyclic dependencies (e.g. "check for cycles", "remove cyclic dependencies", "fix xref cycles"). ## Prerequisite: Elixir Version Cycle detection is correct only on **Elixir 1.19 or higher**. Before running any cycle checks: 1. Verify version: `elixir -v` or inside the project run `mix run -e 'IO.inspect(System.version())'`. 2. If the version is below 1.19, stop and inform the user that upgrading to Elixir 1.19+ is required for reliable cycle detection. ## Detecting Cycles Run both commands from the project root. Start with a relaxed threshold, then tighten: ```bash mix xref graph --format cycles --label compile-connected --fail-above 3 mix xref graph --format cycles --label compile --fail-above 3 ``` - **compile-connected**: cycles in the compile-time dependency graph (modules that compile in a cycle). - **compile**: same graph, different label; both should be run. - **--fail-above N**: exit code fails when cycle count is above N. Use `3` initially, goal is **0**. To list cycles without failing (for inspection), omit `--fail-above` or set it high: ```bash mix xref graph --format cycles --label compile-connected mix xref graph --format cycles --label compile ``` **Goal**: reach `--fail-above 0` for both commands (no cycles). ## Workflow 1. **Check Elixir version** (must be ≥ 1.19). 2. **Establish baseline**: run both xref commands with `--fail-abo...