Conditionally use Base.JuliaSyntax on newer Julia; keep vendored JuliaSyntax for older support

[Copilot]

Nightly started failing in inspect_session because the vendored JuliaSyntax parser rejects syntax now accepted/produced in newer Julia versions. This change switches parser backend by Julia version so newer Julia uses Base.JuliaSyntax, while older supported Julia continues using the vendored copy.

• Backend selection

  • Added a version gate in src/ExplicitImports.jl:
    • VERSION >= v"1.12.0-DEV.0" → use Base.JuliaSyntax
    • older versions → use Vendored.JuliaSyntax
  • Kept a single internal JuliaSyntax binding so downstream parsing logic remains unchanged.

• Vendoring behavior

  • Stopped loading vendored JuliaSyntax on newer Julia entirely.
  • Continued vendoring/loading AbstractTrees as before.

• Regression coverage

  • Added a focused testset in test/runtests.jl to assert:
    • newer Julia uses Base.JuliaSyntax and Vendored.JuliaSyntax is not defined
    • older Julia uses Vendored.JuliaSyntax

const BASE_JULIASYNTAX_VERSION = v"1.12.0-DEV.0"
const USE_BASE_JULIASYNTAX = VERSION >= BASE_JULIASYNTAX_VERSION

module Vendored
using ..ExplicitImports: USE_BASE_JULIASYNTAX
if !USE_BASE_JULIASYNTAX
    include(joinpath("vendored", "JuliaSyntax", "src", "JuliaSyntax.jl"))
end
end

if USE_BASE_JULIASYNTAX
    import Base: JuliaSyntax
else
    import .Vendored: JuliaSyntax
end

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>nightly failure</issue_title>
<issue_description>```julia
inspect_session: Error During Test at /home/runner/work/ExplicitImports.jl/ExplicitImports.jl/test/runtests.jl:1282
Got exception outside of a @test
ParseError:

Error @ line 447:50

  @label fail begin
      ex isa Expr && ex.head === :call || break fail

└───┘ ── unexpected token after break

Stacktrace:
[1] _parse(rule::Symbol, need_eof::Bool, ::Type{ExplicitImports.Vendored.JuliaSyntax.SyntaxNode}, text::String, index::Int64; version::VersionNumber, ignore_trivia::Bool, filename::Nothing, first_line::Int64, ignore_errors::Bool, ignore_warnings::Bool, kws::@kwargs{})
@ ExplicitImports.Vendored.JuliaSyntax ~/work/ExplicitImports.jl/ExplicitImports.jl/src/vendored/JuliaSyntax/src/parser_api.jl:98
┌ [2] _parse
│ @ ~/work/ExplicitImports.jl/ExplicitImports.jl/src/vendored/JuliaSyntax/src/parser_api.jl:82 [inlined]
╰──── repeated 2 times
[4] parseall
@ ~/work/ExplicitImports.jl/ExplicitImports.jl/src/vendored/JuliaSyntax/src/parser_api.jl:148 [inlined]
[5] SyntaxNodeWrapper(file::String; bad_locations::Set{String})
@ ExplicitImports ~/work/ExplicitImports.jl/ExplicitImports.jl/src/parse_utilities.jl:36
[6] SyntaxNodeWrapper
@ ~/work/ExplicitImports.jl/ExplicitImports.jl/src/parse_utilities.jl:19 [inlined]
[7] analyze_all_names(file::String)
@ ExplicitImports ~/work/ExplicitImports.jl/ExplicitImports.jl/src/get_names_used.jl:783
[8] get_names_used
@ ~/work/ExplicitImports.jl/ExplicitImports.jl/src/get_names_used.jl:1039 [inlined]
[9] fill_cache!(file_analysis::Dict{String, ExplicitImports.FileAnalysis}, files::Vector{String})
@ ExplicitImports ~/work/ExplicitImports.jl/ExplicitImports.jl/src/ExplicitImports.jl:405
[10] explicit_imports(mod::Module, file::String; skip::Tuple{Module, Module, Module}, strict::Bool, warn_stale::Nothing, file_analysis::Dict{String, ExplicitImports.FileAnalysis})
@ ExplicitImports ~/work/ExplicitImports.jl/ExplicitImports.jl/src/ExplicitImports.jl:149
[11] explicit_imports
@ ~/work/ExplicitImports.jl/ExplicitImports.jl/src/ExplicitImports.jl:137 [inlined]

<agent_instructions>JuliaSyntax has moved to https://github.com/JuliaLang/julia/tree/master/JuliaSyntax instead of being in its own repo, and I think it may not be being released as a package anymore. We currently vendor JuliaSyntax. I want you to make that vendoring conditional on a Julia version, and for newer julia versions use `Base.JuliaSyntax` instead (and don't load the vendored code at all in that case). Run and ensure tests pass on julia nightly and the lowest supported julia version. You can run julia nightly with juliaup via `juliaup add nightly`, then `julia +nightly --project....`. You can install juliaup with

curl -fsSL https://install.julialang.org | sh -s -- --yes

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes nightly failure #176

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