Fix quote-heavy CPAN parsing and Want contexts

[fglock]

Summary

• index token source-line offsets once per parser, eliminating quadratic parsing of quote-heavy generated sources such as CPAN author CHECKSUMS
• complete bundled Want::want varargs and raw chained-object context behavior
• add upstream-validated regressions and document the six-module compatibility batch

Target results

• Data::OpenStruct::Deep: passes 3 files / 11 tests on system Perl and PerlOnJava
• App::column::run: passes 5 files / 2 tests on PerlOnJava; its 2.3 MB author CHECKSUMS no longer times out
• Dist::Zilla::Plugin::Rinci::AddPrereqs: passes 4 files / 1 test on PerlOnJava
• WordNet::SenseRelate::WordToSet: excluded because system Perl cannot load WordNet::QueryData
• SPVM::Sys::Time::Timezone: excluded because system Perl cannot build its SPVM/SPVM::Resource prerequisite chain
• Oracle::Loader: excluded because the unchanged distribution installs root Loader.pm while its own test requires Oracle/Loader.pm, and system Perl runs zero assertions

Validation

• make — all unit shards, Joni tests, packaging verification, and shadow JAR build pass
• upstream Want regression under system Perl — 4/4 assertions pass
• want_combined_context.t under both JVM and interpreter backends — 4/4 assertions pass
• no distribution preference overrides added

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