Implementation Discovery (internal)

The one authoritative owner of the bounded, read-only pre-write mapper consumed by execute-phase. A phase does not touch the repository until this step has closed its questions and said READY. Nothing else may define what a valid pre-write discovery pass is.

When to use

• execute-phase — before any branch/planning/source write, after the read-only dependency/status/acceptance/phase/feature-28 receipt checks.
• The step runs only on the pre-write route; it is never a general-purpose orientation pass and never a substitute for planning.

Inputs (exact, only these)

The mapper receives only: