fix disasm aborts on an attribute path of 11 or more segments

[wyattgill9]

An attribute path of 11 or more segments aborts the whole disassembly.

$ fix disasm --no-pager -E 'a: a ? b.c.d.e.f.g.h.i.j.k.l'
error: disassembly line too long
$ echo $?
1

$ fix disasm --no-pager -E 'a: a.b.c.d.e.f.g.h.i.j.k.l or 1'
error: disassembly line too long

Ten segments is fine, eleven is not. Plain select without or is not affected — a: a.b.c.d.e.f.g.h.i.j.k.l disassembles cleanly — so it is the operand lines that carry a per-segment token each.

src/expr/tooling/bytecode/disasm.zig:656:

const Line = struct {
    toks: [24]Tok = undefined,
    ...
    overflowed: bool = false,

Overflowing that fixed array sets overflowed, and the render path turns it into error.DisassemblyLineTooLong, which propagates out and kills the command. Nothing is printed at all — not the chunks before the long line, not a truncated version of the line itself.

For a debugging tool, degrading to a truncated line with an ellipsis seems better than refusing to disassemble the program.

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fix 0.3.0 at 1f1a99cf, built -Doptimize=ReleaseSafe with Zig 0.16.0, darwin/aarch64. Reference implementation is Nix 2.34.8.