Added changeset

Author: Jaakko Heusala

.changeset/fix-operationid-starting-with-number.md

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+---
+"swagger-typescript-api": patch
+---
+
+Fix TypeScript generation failure for operationIds starting with numbers
+
+**What:** Fixed an issue where operationIds starting with numbers (e.g., "123getUser") would cause TypeScript generation to fail due to invalid identifier names.
+
+**Why:** OperationIds that start with numbers are not valid JavaScript identifiers, causing syntax errors in the generated TypeScript code.
+
+**How:** Modified the template logic to quote property names for invalid identifiers. OperationIds starting with numbers are now generated as quoted properties (e.g., `"123GetUser": ...`) instead of unquoted invalid identifiers.
+
+This resolves GitHub issue #952.