Introduce shared evidence model and governance imports

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a070b5-4994-7271-bd8b-7c3dbcedec4b

canon.yaml

@@ -1,7 +1,7 @@
 repository: info-tech-canon
 title: InfoTechCanon
 status: service-baseline
-version: 0.7.0
+version: 0.8.0
 description: >
   An evolving, markdown-first canon for building interoperable, adaptable,
   and extensible information-processing systems.
@@ -61,6 +61,11 @@ models:
     title: InfoTechCanonGovernanceModel
     path: infospace/models/governance/InfoTechCanonGovernanceModel.md
     status: RC1-seed
+  - id: itc-evid
+    title: InfoTechCanonEvidenceModel
+    path: infospace/models/evidence/InfoTechCanonEvidenceModel.md
+    status: draft
+    version: 0.1.0
   - id: itc-task
     title: InfoTechCanonTaskModel
     path: infospace/models/task/InfoTechCanonTaskModel.md