Phase A of epic #1258. Adds the single authoritative ADR documenting
the per-runtime skill mapping + converter transform-contract catalog
that ADR-3660 (layout) and ADR-1508 (module ownership) each carry a
third of. Ships a companion reference matrix projecting all 16
runtimes from their capability descriptors.
- docs/adr/1593-skill-mapping-converter-methodology.md (new ADR)
- docs/reference/skill-mapping-matrix.md (new reference page)
- docs/adr/README.md (index row + status fixes: 3660, 1016 Proposed->Accepted)
- docs/adr/1016-runtime-capability-descriptor.md (header Proposed->Accepted;
the ConverterName enum is already code-enforced per ADR-857 phase 5e)
Doc-only. No code, no behavior change. Closes#1593.
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