Support Express 5 stable and fix async handler errors

[alecgibson]

Summary

• Bumps peerDependencies and devDependencies from the alpha Express 5 range (^5.0.0-alpha.1 / ^5.0.0-alpha.6) to the stable ^5.0.0.
• Makes wrapMiddleware async and awaits the user-supplied handler, so rejected promises from async WebSocket handlers are caught by the try/catch and forwarded to next(err) instead of becoming silent unhandled rejections. This also lets Express 5's own promise-handling layer catch any uncaught rejections from the wrapper itself.
• Backwards-compatible with Express 4: errors are still forwarded via next(err), not relying on Express 5 promise handling.

Test plan

• npm install — no peer dependency conflicts with express@5.
• Run an example (node examples/simple.js) against Express 5 and confirm WebSocket connections work.
• Test with an async WebSocket handler that throws — confirm the error reaches Express error middleware rather than becoming an unhandled rejection.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates the package to support stable Express 5 and ensures async WebSocket handlers have their rejected promises/errors forwarded into Express error handling (instead of becoming unhandled rejections), while maintaining Express 4 compatibility via next(err).

Changes:

• Bump Express peer/dev dependency ranges from Express 5 alpha to stable ^5.0.0.
• Make wrapMiddleware async and await the user-supplied handler to catch async rejections and forward them to next(err).
• Update the package version to 5.0.0-reedsy-5.1.0.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/wrap-middleware.js	Awaits user middleware to catch async errors and forward to next(err).
package.json	Updates Express peer/dev dependency ranges and bumps package version.

Comments suppressed due to low confidence (1)

package.json:32

• peerDependencies.express is expanded to include Express 5, but engines.node still claims support for Node >=4.5.0, which cannot run this package as ESM ("type": "module") and also won’t support the newly added async/await usage. Please update the engines.node range to reflect the actual minimum supported Node version (and, if applicable, align it with the Node version used in CI via .nvmrc).

    "express": "^4.0.0 || ^5.0.0"
  },
  "engines": {
    "node": ">=4.5.0"
  },

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