Extend the Temporal banner fix to @fedify/mysql

`@fedify/mysql` was added on the `2.1-maintenance` branch after PR
issue carried into this package.  Its `pollInterval` and
`handlerTimeout` options take a `Temporal.Duration` or
`Temporal.DurationLike`, and the generated `.d.ts` imported
`Temporal` from `@js-temporal/polyfill`, binding the parameter
types to the polyfill's nominal classes.  Users on Node.js 26+
would hit the same nominal mismatch when passing native
`Temporal.Duration` values that PR #768 fixed for the sibling
adapters.

Apply the same `banner.js`/`banner.dts` split as the sibling
adapters: keep the runtime polyfill import in the JS output so
Node.js 22-25 keeps working, and emit
`/// <reference lib="esnext.temporal" />` in the `.d.ts` so the
ambient `Temporal` namespace from `lib.esnext.temporal` resolves
the declared types.

Add a matching `@fedify/mysql` entry to the `Version 2.1.13`
section of the changelog.

`@fedify/astro`, the other new 2.1-only package, doesn't
reference `Temporal` in its source, so no change is needed there.

#767
#768

Assisted-by: Claude Code:claude-opus-4-7

Author: dahlia

.hongdown.toml

@@ -3,6 +3,7 @@ include = ["*.md", "**/*.md"]
 exclude = [
   "**/node_modules/**",
   "**/dist/**",
+  ".agents/skills/**",
   ".claude/skills/**",
   ".github/copilot-instructions.md",
   "AGENT.md",

CHANGES.md

@@ -68,6 +68,15 @@ To be released.
     mismatch.  TypeScript 6.0 or later is required to consume the type
     declarations.  [[#767], [#768]]
 
+### @fedify/mysql
+
+ -  Generated _\*.d.ts_ declarations no longer import from
+    `@js-temporal/polyfill`; they reference the ambient `Temporal` namespace
+    through the `esnext.temporal` lib instead, so `pollInterval` and
+    `handlerTimeout` accept native `Temporal.Duration` values from Node.js
+    26+ without a nominal type mismatch.  TypeScript 6.0 or later is
+    required to consume the type declarations.  [[#767]]
+
 
 Version 2.1.12
 --------------

packages/mysql/tsdown.config.ts

@@ -10,16 +10,13 @@ export default defineConfig({
     if (format === "cjs") return { js: ".cjs", dts: ".d.cts" };
     return { js: ".js", dts: ".d.ts" };
   },
-  outputOptions(outputOptions, format) {
-    if (format === "cjs") {
-      outputOptions.intro = `
-        const { Temporal } = require("@js-temporal/polyfill");
-      `;
-    } else {
-      outputOptions.intro = `
-        import { Temporal } from "@js-temporal/polyfill";
-      `;
-    }
-    return outputOptions;
+  banner({ format }) {
+    const js = format === "cjs"
+      ? `const { Temporal } = require("@js-temporal/polyfill");`
+      : `import { Temporal } from "@js-temporal/polyfill";`;
+    return {
+      js,
+      dts: `/// <reference lib="esnext.temporal" />`,
+    };
   },
 });