Upgrade metacolon dependency

[FND]

I'm afraid I imposed a few breaking changes upon us, for no good reason:

• requires Node v22 (for iterator helpers, mostly)
• whitespace trimming is now much more limited

The latter explains the failing tests, but I'm currently unsure how best to fix this...

[moonglum]

Not super happy to bump a faucet-pipeline package all the way up to 22, but I think it is okay for aiur. Thanks for checking in here 🙇

[FND]

To be honest, it seems perfectly fine for aiur to keep using metacolon 1.x for eternity. I just wasn't keen on worrying about soon-to-be-legacy runtimes in this particular rewrite.

If you do want to upgrade, I'd tried tracing the trailing \n to tree.js and page.js, but I feel like I no longer have a good grasp of how aiur works. metacolon 2.0 no longer trims whitespace though, so that's almost certainly the reason here.

[FND]

Never mind, I was being stupid: All fixed now.

EXCEPT: metacolon 2.0 currently assumes POSIX line endings (i.e. \n, no CRLF or any of that business). That might become an issue for users? (It's not an intentional limitation, just that I ran out of steam and didn't wanna deal with that particular hassle... )

[FND]

FWIW, your comment also made me realize that supporting Node v20 only takes trivial changes.

... except require($esm) doesn't work... 🤦 😩

[FND]

Turns out there are other issues here: I recommend not upgrading metacolon, probably ever. 😬