refactoring for canon conformity

tests/test_canon.py

@@ -0,0 +1,68 @@
+from railiance_fabric.canon import (
+    CANONICAL_EDGE_TYPES,
+    CANONICAL_NODE_CATEGORIES,
+    DISPLAY_ONLY_EDGE_TYPES,
+    edge_canon_mapping,
+    evidence_state_for,
+    node_canon_mapping,
+)
+
+
+def test_wp0016_target_taxonomy_is_registered() -> None:
+    assert set(CANONICAL_NODE_CATEGORIES) >= {
+        "source-repository",
+        "software-system",
+        "service",
+        "endpoint",
+        "deployment",
+        "runtime-resource",
+        "datastore",
+        "flow",
+        "policy",
+        "control",
+        "evidence",
+        "task",
+        "consumer-purpose",
+        "telemetry-signal",
+    }
+    assert set(CANONICAL_EDGE_TYPES) >= {
+        "built_from",
+        "implements",
+        "exposes",
+        "depends_on",
+        "deploys",
+        "flows_to",
+        "governed_by",
+        "evidenced_by",
+        "observed_by",
+        "part_of",
+        "reads_or_writes",
+        "creates_task",
+    }
+    assert set(DISPLAY_ONLY_EDGE_TYPES) >= {
+        "collapsed_into",
+        "grouped_with",
+        "highlight_path",
+        "near",
+        "same_color_group",
+    }
+
+
+def test_legacy_fabric_terms_map_without_becoming_display_edges() -> None:
+    assert node_canon_mapping("Repository").category == "source-repository"
+    assert node_canon_mapping("KubernetesDeployment").category == "runtime-resource"
+    assert node_canon_mapping("DependencyDeclaration").fit == "gap"
+
+    assert edge_canon_mapping("exposes").canonical_type == "exposes"
+    assert edge_canon_mapping("provides").canonical_type == "implements"
+    assert edge_canon_mapping("binds:exact").canonical_type == "depends_on"
+    assert edge_canon_mapping("resolves_to").canonical_type == "flows_to"
+    assert edge_canon_mapping("declares").display_only is True
+
+
+def test_evidence_state_separates_origin_from_review_state() -> None:
+    assert evidence_state_for(origin="repo_declaration", source_kind="declaration") == "declared"
+    assert evidence_state_for(origin="llm", source_kind="llm") == "proposed"
+    assert evidence_state_for(origin="deterministic", source_kind="", confidence=0.4) == "inferred"
+    assert evidence_state_for(origin="deterministic", source_kind="package_registry") == "observed"
+    assert evidence_state_for(review_state="rejected") == "gap"