Plan Marshall Plugin - Build Discovery

Enforcement

Execution mode: Reference module — loaded by extension-api for build system discovery.

Prohibited actions:

• Do not call discovery scripts directly; use extension-api commands instead
• Do not modify discovery delegation order
• Do not alter build system marker detection logic without updating all delegated scripts

Constraints:

• Module discovery is read-only — no file system mutations
• Results are consumed by manage-architecture and marshall-steward
• All discovery invocations flow through the extension-api entry point

Consolidates module discovery for all build systems (Maven, Gradle, npm, Python) into a single extension point. Also provides the general-dev domain with cross-cutting development skills. Build execution scripts live in sibling skill directories (build-maven, build-gradle, build-npm, build-pyproject).