arcpy / toolbox (.tbx/.pyt) translation lane

[mikemcdougall]

Scope

Add a translation lane (TRANSLATE, not emulate) that parses ArcGIS toolbox metadata (.tbx / .pyt) into Honua GP process descriptors, with an explicit unsupported-report for constructs that cannot be translated. This needs ArcGIS Pro / arcpy fixtures.

Acceptance Criteria

• Given a sample .tbx and a sample .pyt, the lane parses tool metadata (parameters, data types, dependencies) and emits Honua GP process descriptors that round-trip the parameter signatures.
• Constructs that cannot be translated (custom Python execution, unsupported parameter/data types, environment dependencies) are captured in an explicit unsupported-report rather than silently dropped or stubbed as executable.
• The lane does NOT attempt to emulate arcpy execution; translated descriptors map only to existing/native Honua executors, and untranslatable tools are clearly marked unsupported.
• Fixture-based tests cover a translatable tool, a partially-translatable tool (some params unsupported), and a fully-unsupported tool, each producing the documented report. (Flag: requires ArcGIS Pro/arcpy fixtures.)

Effort

XL.

Dependencies

GP process descriptor model. Flag: needs ArcGIS Pro/arcpy fixtures.

Parent: #1259