chore(oxfmt): enable JSDoc formatting

oxfmt 0.37+ formats JSDoc comments. Adopt the canonical `jsdoc` block
from socket-repo-template; it preserves the existing JSDoc style across
this repo (verified: zero new diff under the new config).

Source of truth: socket-repo-template/template/.oxfmtrc.json. Future
updates flow through `scripts/sync-scaffolding.mjs --all --fix`.

Author: jdalton

.oxfmtrc.json

@@ -12,6 +12,19 @@
   "bracketSameLine": false,
   "bracketSpacing": true,
   "singleAttributePerLine": false,
+  "jsdoc": {
+    "addDefaultToDescription": false,
+    "bracketSpacing": false,
+    "capitalizeDescriptions": true,
+    "commentLineStrategy": "multiline",
+    "descriptionTag": false,
+    "descriptionWithDot": true,
+    "keepUnparsableExampleIndent": false,
+    "lineWrappingStyle": "greedy",
+    "preferCodeFences": false,
+    "separateReturnsFromParam": false,
+    "separateTagGroups": true
+  },
   "ignorePatterns": [
     "**/.cache",
     "**/.claude",