chunk

Isolate, research, compare, implement, and simplify exactly one coherent kernel of code. Use when the user invokes $chunk, asks to decompose work into one small surgical slice and compare implementation options before editing, or asks to trace and implement one recurring simplification across a large diff. Accept $chunk [plan-or-slice] and $chunk review [branch|path|git-ref]. Do not use for broad milestone execution, ordinary feature implementation, brainstorming alone, or report-only code review.