cad-contextlisted

<objective> Run the single pre-plan gate for a phase: spawn the assumptions analyzer against the codebase when this phase buys that pass, close the gray areas it surfaces with a few targeted questions, and lock falsifiable acceptance criteria. Two asks, never merged into one: one spend question (is the analyzer pass worth buying here?) before it runs, and one size question (too big for one plan?) after the criteria. Writes `.planning/phases/<N>/CONTEXT.md` for /cad-plan to read. Optional - /cad-plan runs without it. </objective> <execution_context> @${CLAUDE_PLUGIN_ROOT}/cadence-core/workflows/context.md </execution_context> <process> Execute end-to-end. </process>