docs: add Python tree-sitter font-lock predicate-mismatch diagnostic

Pins down why every Python buffer fires `treesit-query-error` on redisplay: Emacs 30.2 emits `#match` predicates, but tree-sitter 0.26 only accepts `#match?`. The doc has the reproduction, the six fix options with their trade-offs, and the verification path. The next pass picks up at decision-time instead of re-deriving the cause.

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