docs: Deprecation of patternKey and patternValue in input schema

[mfori]

Note

Marks patternKey and patternValue as deprecated in object/array fields and adds a deprecation section with migration examples using items subschemas.

• Docs — Input schema:
  • Deprecation: Adds a warning section deprecating patternKey and patternValue (supported until May 31, 2026) with rationale and scope.
  • Object fields: Updates properties table to mark patternKey and patternValue as deprecated and link to the deprecation section.
  • Array fields:
    • Reorganizes properties table and marks patternKey/patternValue as deprecated with migration link.
    • Adds migration examples replacing patternValue (strings) and both patternKey/patternValue (key-value pairs) with items subschemas.
  • Guidance: Notes no direct replacement for objects; recommends using predefined properties schemas.

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