Replace evidence context with source unit excerpts

internal/framework/evidencecontext/assets/schemas/source_evidence_context.v1.json

@@ -2,24 +2,8 @@
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "notarius.source.evidence_context",
   "title": "notarius_source_evidence_context_v1",
-  "type": "object",
-  "additionalProperties": false,
-  "required": ["source_id", "source_digest", "window_units", "selected_lanes", "contexts"],
-  "properties": {
-    "source_id": {"type": "string", "minLength": 1},
-    "source_digest": {"type": "string", "pattern": "^sha256:[0-9a-f]{64}$"},
-    "window_units": {"type": "integer", "minimum": 0},
-    "selected_lanes": {
-      "type": "array",
-      "minItems": 1,
-      "uniqueItems": true,
-      "items": {"type": "string", "minLength": 1}
-    },
-    "contexts": {
-      "type": "array",
-      "items": {"$ref": "#/$defs/context"}
-    }
-  },
+  "type": "array",
+  "items": {"$ref": "#/$defs/unit"},
   "$defs": {
     "source_ref": {
       "type": "object",
@@ -42,25 +26,6 @@
         "ref": {"$ref": "#/$defs/source_ref"},
         "metadata": {"type": "object", "additionalProperties": true}
       }
-    },
-    "evidence_ref": {
-      "type": "object",
-      "additionalProperties": false,
-      "required": ["lane_id", "source_ref"],
-      "properties": {
-        "lane_id": {"type": "string", "minLength": 1},
-        "source_ref": {"$ref": "#/$defs/source_ref"}
-      }
-    },
-    "context": {
-      "type": "object",
-      "additionalProperties": false,
-      "required": ["context_ref", "evidence_refs", "units"],
-      "properties": {
-        "context_ref": {"$ref": "#/$defs/source_ref"},
-        "evidence_refs": {"type": "array", "minItems": 1, "items": {"$ref": "#/$defs/evidence_ref"}},
-        "units": {"type": "array", "minItems": 1, "items": {"$ref": "#/$defs/unit"}}
-      }
     }
   }
 }