Value unification

[olynch]

This pull request unifies the various "value" enums into a single generic enum that looks like

enum Value<I> {
  Id(I)
  Int(i32)
  Str(String)
}

Unfortunately, this means that some of the conversions that used to be done with .into have to be a little more explicit, because we can't implement a generic From<I>.

We also rename the various RowId variants to be a bit more consistent. The renaming is across the following axes

• Txn vs no Txn -- row ids that might appear temporarily as part of a transaction, or permanent row ids
• Live vs. Wire vs. Packed -- Live is row ids created as part of a transaction that automatically turn into permanent row ids after the transaction is done (which we will remove soon), Wire is row ids in the wire format (e.g. with commit hash), and Packed is row ids in the packed format (e.g. with commit id produced by an IdMapper).

So what used to be RowId is now WireRowId, what used to be RowHandle is TxnLiveRowId, what used to be RowRef is TxnWireRowId, PackedRowId remains the same.

As a convenience, we have type aliases type XXXValue = Value<XXXRowId>, so WireValue = Value<WireRowId>, and so on.

[olynch]

I think I'm going to make another PR that removes the current coln-js-runtime on the trunk-for-2026-09-demo branch.

[incipit0]

This looks really nice! Given this is a big refactoring, and does not have much functional change, perhaps merge it into main once it's ready, because it will affect almost all future work.

I skimmed through it, but the only functional difference is the liven_all method is that right? I think it otherwise looks good.

Also is the coln-js-runtime problem easy to fix?

[incipit0]

@lstwn this is a bit unsatisfying, but Owen temporarily changed the value in the IR to be a i32, to make the JS side nice, I think. Seems to be a pretty substantial change to make all values in coln-query i32, so I did this. What do you think?

[lstwn]

Fine, it's just a test util and it's never called with a value that doesn't fit an i32 so we could also change call sites. But given this is just temporary, we can keep it like this.