feat(coding-agent): reduce bundled startup work

scripts/build-coding-agent-bundle.mjs

@@ -17,6 +17,7 @@ const banner = {
 };
 const allowedExternalPackages = new Set([
 	"@silvia-odwyer/photon-node",
+	"jiti",
 	// Optional native accelerators. Their callers fall back to JavaScript when absent.
 	"bufferutil",
 	"utf-8-validate",
@@ -24,6 +25,13 @@ const allowedExternalPackages = new Set([
 	"supports-color",
 ]);
 
+const lazyJitiPlugin = {
+	name: "lazy-jiti-transform",
+	setup(build) {
+		build.onResolve({ filter: /^jiti\/static$/ }, () => ({ external: true, path: "jiti" }));
+	},
+};
+
 function commonBuildOptions() {
 	return {
 		absWorkingDir: repoRoot,
@@ -38,6 +46,10 @@ function commonBuildOptions() {
 		minifySyntax: true,
 		minifyWhitespace: true,
 		platform: "node",
+		// The source uses jiti/static so Bun embeds its Babel transform. The Node
+		// package can use regular jiti from its direct dependency and load Babel
+		// only when an extension actually needs transformation.
+		plugins: [lazyJitiPlugin],
 		sourcemap: false,
 		target: "node22.19",
 		// Do not apply the monorepo's source-oriented path aliases while bundling