fix: bundle generated warmer handler to avoid missing @smithy runtime dependency #364
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Context: When using Serverless Framework v4 (or packaging with warmup patterns that only include .warmup/**), the generated warmup handler imports @smithy/node-http-handler (and @aws-sdk/client-lambda) but the warmer artifact does not include node_modules, causing runtime ERR_MODULE_NOT_FOUND.
Root cause: The plugin’s default packaging pattern excludes node_modules, but the generated handler depends on external modules.
Change: After writing .warmup//index.mjs, bundle it with esbuild into a self-contained ESM file and replace the original index.mjs.
Result: The warmer artifact remains minimal and works without requiring users to manually include node_modules patterns; fixes missing module errors for @smithy/*.
Verification: