Delegate with null pipe for incompatible value types

[henriquemoody]

Separate handling of invalid formatters from non-scalar values. When a formatter is recognized but the value type is incompatible, pass null to the next modifier instead of the original pipe. This prevents incorrectly suggesting the next modifier should retry with the same formatter.

Added tests using data providers to verify the distinction between pipe not being valid and modifier being unable to modify values.

Assisted-by: OpenCode (GLM-4.7)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.55%. Comparing base (113499a) to head (650269a).

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #19   +/-   ##
=========================================
  Coverage     99.54%   99.55%           
  Complexity      199      199           
=========================================
  Files            29       29           
  Lines           444      446    +2     
=========================================
+ Hits            442      444    +2     
  Misses            2        2           

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