feat(unenv-preset): add native node:tty module support

[petebacondarwin]

Devin PR requested by @petebacondarwin

Adds support for the native node:tty module from workerd when the enable_nodejs_tty_module and experimental compatibility flags are enabled. This follows the same pattern as other experimental modules (inspector, sqlite, dgram, stream_wrap, repl).

The native code appears in workerd as of https://github.com/cloudflare/workerd/blob/main/src/node/tty.ts. It is currently experimental with no default enable date.

Implementation Comparison

Export	workerd	unenv	Breaking change?
isatty	returns false	returns false	No (same)
ReadStream	constructor throws ERR_METHOD_NOT_IMPLEMENTED	creates stub object	No (workerd is stricter)
WriteStream	constructor throws ERR_METHOD_NOT_IMPLEMENTED	creates stub object	No (workerd is stricter)

Breaking change analysis: There are no breaking changes when moving from unenv to workerd. Both implementations return false for isatty(). For ReadStream/WriteStream constructors, the unenv stub creates stub objects while workerd throws ERR_METHOD_NOT_IMPLEMENTED. This is a stricter behavior in workerd but not a breaking change since code that worked with unenv stubs would need to handle the objects anyway.

Human Review Checklist

• Verify the getTtyOverrides() function follows the same pattern as other experimental modules
• Confirm the test correctly validates throw behavior only when native module is enabled

Link to Devin run

---

• Tests
  • Tests included
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: internal experimental feature, follows existing patterns

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🦋 Changeset detected

Latest commit: be6cbec

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commit: be6cbec