ci(lint): drop revive exported rule; require no doc-comment boilerplate

Revive's `exported` check forced doc comments on every exported symbol —
that conflicts with the project's policy of only writing comments when
the "why" is non-obvious. Keep `var-naming`, `unused-parameter`, and
`early-return` for signal that doesn't mandate prose.

.golangci.yml

@@ -16,10 +16,13 @@ linters:
 
 linters-settings:
   revive:
+    # Intentionally narrow: we skip `exported` (no doc-comment requirement) per
+    # the project's no-boilerplate-comment policy. Re-enable if the public API
+    # surface grows to the point where documentation lives alongside it.
     rules:
       - name: var-naming
-      - name: exported
+      - name: unused-parameter
-        arguments: ["checkPrivateReceivers", "sayRepetitiveInsteadOfStutters"]
+      - name: early-return
 
 issues:
   exclude-use-default: false