feat: narrow generated types and validators to the real data contract

Three schema cases previously emitted types wider than the data they
describe, weakening consumer type-safety and runtime validation:

- RFC 3339 string formats (date, date-time, time, duration) now emit
  template-literal types plus matching regex validators. Previously only
  date-time was handled, and as the opaque Jsonify<Date>.
- integer/int64 now maps to bigint, since its range exceeds
  Number.MAX_SAFE_INTEGER and number would silently lose precision.
- enums short-circuit all type-specific constraints and emit a bare
  picklist/literal/union, including null and non-string members. Layering
  string()/minLength() on an enum produced misleading "expected string"
  errors when the contract is simply "one of [...]".

BREAKING: emitted types change for the single consumer. DateTime is now a
template-literal string instead of Jsonify<Date>, and int64 fields are
bigint instead of number; both require consumer updates.

Author: maxholman

__tests__/__snapshots__/nullables.test.ts.snap

@@ -28,7 +28,7 @@ exports[`header parameters 1`] = `
 export type UploadStatus = "pending" | "complete";
 export type UploadDataCommandHeader = {
         "content-type": "application/json" | "text/csv" | "application/xml";
-        "content-length": \`\${number}\`;
+        "content-length": \`\${bigint}\`;
         "x-idempotency-key"?: string;
     };
 export type UploadDataCommandParams = {
@@ -144,9 +144,9 @@ exports[`query and header integer params coerce strings to numbers 1`] = `
 "import type { UndefinedOnPartialDeep } from "type-fest";
 
 export type Dummy = string;
-export type ExpireTime = number;
+export type ExpireTime = bigint;
 export type ListFilesCommandQuery = {
-        exp: \`\${number}\`;
+        exp: \`\${bigint}\`;
         limit?: \`\${number}\`;
     };
 export type ListFilesCommandHeader = {

__tests__/fixtures/docker/commands-validated.ts

@@ -3,7 +3,7 @@
  *
  * WARN: Do not edit directly.
  *
- * Generated on 2026-06-08T01:23:59.032Z
+ * Generated on 2026-06-09T09:18:39.851Z
  *
  */
 /** eslint-disable max-classes */

__tests__/fixtures/docker/commands.ts

@@ -3,7 +3,7 @@
  *
  * WARN: Do not edit directly.
  *
- * Generated on 2026-06-08T01:23:59.032Z
+ * Generated on 2026-06-09T09:18:39.851Z
  *
  */
 /** eslint-disable max-classes */

__tests__/fixtures/docker/enums.ts

@@ -3,7 +3,7 @@
  *
  * WARN: Do not edit directly.
  *
- * Generated on 2026-06-08T01:23:59.032Z
+ * Generated on 2026-06-09T09:18:39.851Z
  *
  */
 /**

__tests__/fixtures/docker/hono-valibot.ts

@@ -4,7 +4,7 @@ import { PublicValibotHonoError } from "@block65/rest-client";
  *
  * WARN: Do not edit directly.
  *
- * Generated on 2026-06-08T01:23:59.032Z
+ * Generated on 2026-06-09T09:18:39.851Z
  *
  */
 import { validator } from "hono/validator";

__tests__/fixtures/docker/main.ts

@@ -3,7 +3,7 @@
  *
  * WARN: Do not edit directly.
  *
- * Generated on 2026-06-08T01:23:59.032Z
+ * Generated on 2026-06-09T09:18:39.851Z
  *
  */
 import {