SPEC v1.2 : la mesure nomme ce qu'elle a examiné (relations.confirms)

Le sens est la décision entière : c'est la MESURE qui déclare ce qu'elle
confirme, jamais l'assertion confirmée qui pointe en retour. Trois raisons
suffisantes chacune : l'assertion confirmée existe déjà et ne se réécrit
pas ; l'instrument sait ce qu'il a mesuré — le lien est inféré, jamais
saisi ; et l'auteur d'une confirmation est la machine, non l'agent dont
l'affirmation est confirmée. Le runner refuse confirms sur autre chose
qu'une mesure de provenance measured.

Mineur et ignorable : un consommateur qui ignore la clé la préserve.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

envelope/schema/assertion.schema.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "https://prismagram.com/published-language/envelope/1.0/assertion.schema.json",
-  "title": "Assertion Envelope v1.1",
+  "title": "Assertion Envelope v1.2",
   "description": "Producer contract for envelope v1.1 messages (SPEC.md §4). One cross-field rule cannot be expressed here and is enforced by the conformance runner: `jurisdiction` MUST equal the prefix of `id`.",
   "type": "object",
   "required": [
@@ -26,9 +26,10 @@
       "enum": [
         "0.1",
         "1.0",
-        "1.1"
+        "1.1",
+        "1.2"
       ],
-      "description": "Version of the contract. v1.0 is substantively identical to v0.1 (SPEC §8): both values validate. v1.1 adds the optional declared reading (§4.1). A message that does not declare its version is not versioned (A1 §3)."
+      "description": "Version of the contract. v1.0 is substantively identical to v0.1 (SPEC §8): both values validate. v1.1 adds the optional declared reading (§4.1); v1.2 adds the relation kind `confirms` (§4.2). A message that does not declare its version is not versioned (A1 §3)."
     },
     "id": {
       "type": "string",
@@ -154,6 +155,10 @@
         },
         "satellite_of": {
           "$ref": "#/$defs/idList"
+        },
+        "confirms": {
+          "$ref": "#/$defs/idList",
+          "description": "v1.2, §4.2. Carried by a `measure` of provenance `measured` only: the ids it examined. The measure points at what it confirms; the confirmed assertion is never edited to point back."
         }
       },
       "additionalProperties": false