fix: lexer splits -0 after Minus to remove decl-parse hijack#378
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The post-lex split that turns Number(-N) into Minus + Number(N) now fires when the preceding token is Minus. Fixes `- -0 a bo` mis-parse as decl boundary. Note: collateral semantics change to `- -N M` family (now Negate(Subtract(N, M)); was Subtract(-N, M)); pinned with explicit regression test. Closes scientific-researcher rerun9.
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Closes scientific-researcher rerun9. Lexer split-context predicate extended to include Minus token. New reading of
- -N Mfamily pinned with regression test.