[Codegen#70] spec-artifacts-process has no interface archetype, so quire coverage cannot mine interface-001 #70

Problem

spec/interface/interface-001-codegen-api.md declares five acceptance criteria
(interface-001-AC-1 through interface-001-AC-5) that are verified by real automated
tests in tests/interface_001.rs, which run on every cargo test in make ci. Their
correct verification method is Test (TC-028).

The active spec-artifacts-process module declares matrix-mining archetypes for FR,
NFR, StR, TestMatrix, SuiteRegistry and Inspections, but none for interface
documents. quire coverage therefore cannot mine interface-001-codegen-api.md at all:
interface-001-AC-1 through interface-001-AC-5 resolve to no declared row for any
archetype to check, and the ## Interface Requirement Coverage row in
spec/test-matrix.md is never cross-checked against this file's acceptance-criteria
table. A ✅ Covered status there is a status the gate can never contradict — not
because the criteria are actually unverifiable by tooling, but because no archetype
exists to let quire coverage see them at all.

One symptom: the /// Trace: interface-001-AC-N, TC-028 lines in
tests/interface_001.rs produce dangling-trace warnings under quire coverage --strict,
because the AC ids they cite resolve to nothing minable. Those warnings are intentional
and should stay visible — they are the honest marker of this gap — rather than being
silenced by cutting the AC ids from the Trace: lines or by mislabeling the criteria as
Inspection (human attestation) when a machine test already verifies them on every
cargo test.

Fix

Add an interface archetype to spec-artifacts-process that mines an interface
document's acceptance-criteria table the way the existing archetypes mine FR/NFR/StR
criteria tables, so quire coverage can resolve interface-001-AC-1 through
interface-001-AC-5 as declared rows and cross-check them against
spec/test-matrix.md's ## Interface Requirement Coverage section and against the
Trace: lines in tests/interface_001.rs.

References

• spec/interface/interface-001-codegen-api.md — Open items
• spec/test-matrix.md — ## Interface Requirement Coverage
• tests/interface_001.rs