feat: comment categories; emend, relink and resolve corrections

scienting-layer/1: an optional, fixed category on comment, caveat and
question bodies (comment, context, critique, question, correction,
feedback, resource).

Corrections: emend fixes the authors' own slip and keeps what was printed
(a run's printed), never lowering fidelity or a witness match; relink sets
or removes what a citation names; resolve sets a reference's resolution.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017R7sgDNvUGWY2zFPCq2JH6

schemas/runs.schema.json

@@ -3,6 +3,13 @@
   "$id": "https://paperspec.scient.ing/schemas/runs.schema.json",
   "title": "Inline runs",
   "description": "The runs of a sentence, cell, reference, authors or keywords node; spec/03-nodes.md.",
+  "$defs": {
+    "printed": {
+      "description": "The run's text as the paper prints it, kept by an emend correction (spec/03 §3.5, spec/11 §11.1).",
+      "type": "string",
+      "minLength": 1
+    }
+  },
   "type": "array",
   "minItems": 1,
   "items": {
@@ -31,6 +38,9 @@
             },
             "minItems": 1,
             "uniqueItems": true
+          },
+          "printed": {
+            "$ref": "#/$defs/printed"
           }
         },
         "required": [
@@ -79,6 +89,9 @@
           "text": {
             "type": "string",
             "minLength": 1
+          },
+          "printed": {
+            "$ref": "#/$defs/printed"
           }
         },
         "required": [
@@ -110,6 +123,9 @@
           "text": {
             "type": "string",
             "minLength": 1
+          },
+          "printed": {
+            "$ref": "#/$defs/printed"
           }
         },
         "required": [
@@ -138,6 +154,9 @@
           "text": {
             "type": "string",
             "minLength": 1
+          },
+          "printed": {
+            "$ref": "#/$defs/printed"
           }
         },
         "required": [
@@ -159,6 +178,9 @@
           "text": {
             "type": "string",
             "minLength": 1
+          },
+          "printed": {
+            "$ref": "#/$defs/printed"
           }
         },
         "required": [