[fglock]

Summary

• Fix multiline positive-lookahead matching for Text::YAWikiFormater (Text::YAWikiFormater CPAN tests fail independently of #1212 #1596).
• Diagnose malformed and out-of-class Object::Pad BUILD declarations (Report malformed Object::Pad BUILD declarations clearly #1808).
• Add a lexical parser keyword provider and a documented Function::Parameters subset with named, anonymous, and runtime-installed fun/method, configured aliases and invocants, strict/lax arity, type checks and coercions, callback and Moose type reification, attributes, method @_ forwarding, signature introspection, and clear parser diagnostics (Design a parser keyword-plugin API for PerlOnJava #1292, Implement Function::Parameters compatibility using native signatures and parser support #1361).
• Compile format argument expressions for write-time execution on both backends, preserving declaration lexicals and Perl expression behavior (Implement executable format argument expressions #1234).
• Document the parser keyword-plugin contract and module-provider lifecycle.

Validation

• Full nice -n 19 timeout 3600 make: passed at commit 2962c4465 in 20m 55s.
• make check-links: 567 links passed.
• function_parameters_metadata_and_strict.t: all 107 assertions pass under system Perl, JVM, and interpreter.
• Added prototype_underscore_warning_diagnostics.t and signature_named_validation_regressions.t. The named-signature test passes all 4 assertions on JVM and interpreter; the prototype diagnostic oracle passes under system Perl, and the focused PerlOnJava gate passes.
• The reported core tests now pass on both backends: comp/proto.t 216/216 and op/signatures.t 1222/1222. Comparing master showed both passed there, while the PR parent reproduced 213/216 and 1220/1222. The fixes preserve complete malformed-underscore warnings, report unknown named keys before missing required keys, and allow native @ slurpy signatures to accept an odd positional tail.
• Function::Parameters upstream follow-up files pass on both backends: types_custom_2.t (4), types_caller.t (20), types_inline.t (14), and types_moose.t, _2, _3 (49 each); gorn.t (4), precedence.t (11), and types_parse.t (2) also pass.
• The last serialized 56-file upstream run reported 45 passing files, 4 errors, and 7 incomplete files. Remaining gaps include composite auto type expressions, runtime errors in elsewhere.t and lineno-torture.t, a warning-category difference in stringy_h.t, and incomplete upstream files. The design document records this classification and the exact incomplete cases.
• Perl core op/write.t: 636/636 assertions passed. Text::YAWikiFormater 0.51: all seven test programs passed on PerlOnJava and system Perl; format.t and urls.t were explicitly rechecked on the current build.
• The focused Object::Pad BUILD diagnostic test passes on PerlOnJava. The format argument execution and lexical-scope regressions pass on system Perl, JVM, and interpreter.
• GraphQL compile and request-handler checks pass. Two WebSocket ordering assertions remain timing-sensitive on this busy host; isolated probes pass on both implementations and the timing difference still needs a less-contended runner.

Remaining work

This remains a draft while the remaining upstream compatibility gaps and GraphQL WebSocket timing difference are investigated. Issues #1808, #1596, #1361, and #1234 remain open on GitHub pending review and merge.