Summary

• remove Deno runtime shim generation from the published plugin build and switch Node-facing code paths to node: built-ins
• fix package loading regressions in config/session runtime code and add a packaging regression test that imports the built ESM entrypoint under Node
• restore graceful shutdown registration for Node runtimes and keep the packaging fix covered by runtime teardown tests

Test Plan

• deno test src/config.test.ts src/services/logger.test.ts src/services/session-executor.test.ts src/services/runtime-teardown.test.ts
• deno test -A packaging.test.ts
• deno task check
• deno task lint