feat: implement `grind_annotated` command - Add syntax declaration in Init/Grind/Annotated.lean - Add elaborator with YYYY-MM-DD date validation in Lean/Elab/Tactic/Grind/Annotated.lean - Add SimplePersistentEnvExtension to track grind-annotated modules - Add filterGrindAnnotated wrapper for Selector - Apply filter to sineQuaNonSelector in default library suggestions - Set caller field to "grind" when grind tactic calls LibrarySuggestions
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