Annotate postposed adjectives that do not agree in case; reynir 3.7 compatibility

[vthorsteinsson]

Summary

• New error annotation P_NT_LoEftirNlMeðAndlagi: flags a postposed adjective (typically a past participle) with a case-governed complement that does not agree with its head noun phrase in case, e.g. "Þórsmörk ehf., móðurfélag Árvakurs hf., útgáfufélags Morgunblaðsins og fleiri félaga tengdum rekstri Morgunblaðsins, tapaði 346 milljónum á síðasta ári." — where "tengdum" should be "tengdra" (genitive, agreeing with "félaga"). This error commonly arises from attraction to the dative complement of the participle. The handler generates a corrected word form via BinPackage lookup_variants(), preserving number, gender and degree while replacing the case. Note that strong/weak declension variants must not be passed to lookup_variants(), as they do not map onto the FSB/FVB inflection marks.
• Compatibility with reynir >= 3.7: Greynir.__init__() now rejects unknown keyword arguments, so GreynirCorrect filters its own options (one_sent, all_errors, ...) against Greynir._KNOWN_OPTIONS before delegating. Without this, the test suite does not even collect against reynir 3.7.x.

Dependencies

The grammar half of the new rule (VillaLoEftirNlMeðAndlagi in the $if(include_errors) section of Greynir.grammar) lives in GreynirEngine and will arrive with its next release. The handler is inert until then (the nonterminal never occurs in a parse), and the new test skips itself when the installed reynir lacks the rule, so CI stays green against current PyPI reynir.

Test plan

• Full test suite passes locally (84 tests) against a local GreynirEngine checkout that includes the grammar rule.
• New test test_adjective_agreement covers: erroneous sentence annotated with the right span/code, correct counterpart not annotated, and the suggestion ("tengdum" → "tengdra").
• Spot-checked ordinary sentences for false positives (none observed); the error production carries $score(-999) and low priority, so it only participates when no valid parse exists.

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