[typescript][cli] chore: drop type-safety comments on real-handling defaults

`TsVisitor` and `CodegenContext` are exported: a parsed union can have no `types`, and a context can be created without `config`.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VazhaQJ1EYc8Mk39FnQxJ6

Author: claude

packages/graphql-codegen-cli/src/config.ts

@@ -424,7 +424,6 @@ export class CodegenContext {
         };
       } else {
         this.config = {
-          // This `generates: {}` is only to satisfy type safety: a context created without `config` still fails with codegen's missing "generates" error
           generates: {},
           ...this._config,
           pluginContext: this._pluginContext,

packages/plugins/typescript/typescript/src/visitor.ts

@@ -246,7 +246,6 @@ export class TsVisitor<
       ];
     }
     const originalNode = parent[key] as UnionTypeDefinitionNode;
-    // This `|| []` is only to satisfy type safety: a union without members has no types to list
     const possibleTypes = (originalNode.types || [])
       .map(t =>
         this.scalars[t.name.value] ? this._getScalar(t.name.value, 'output') : this.convertName(t),