Note

Reverts prior depth-limiting behavior and simplifies path/update handling.

• Removes MAX_DEPTH and calculate_value_depth from json_path/select_value; drops all recursion-depth checks across set_value, merge_value, arr_append/insert, etc., and refactors path traversal to not track depth
• Makes error helpers crate-private and deletes err_recursion_limit_exceeded
• RDB loader now deserializes with recursion limit disabled; tests updated to allow exceeding overall nesting via updates and to verify unbounded-depth RDB restore, while still erroring on overly deep single-value roots

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