Add test coverage for code_unknown and recode_unknown parameters in recodeSex

[Copilot]

The code_unknown and recode_unknown parameters in recodeSex lacked test coverage, particularly for edge cases where code_unknown is NA and when unknown values are inferred from the data.

Changes

• 7 new test cases covering:

  • Explicit code_unknown values
  • code_unknown = NA edge case (NA values recoded to unknown)
  • Automatic inference of unknown values when code_unknown is NULL
  • Custom recode_unknown parameter values
  • Behavior with only code_male or only code_female specified
  • Numeric code values

• Improved documentation for code_unknown parameter to describe NA handling and automatic inference behavior

Example Usage

# code_unknown = NA: treats NA sex values as unknown
recodeSex(ped, code_male = "M", code_female = "F", code_unknown = NA, 
          recode_unknown = "Unknown")

# code_unknown = NULL: infers values not matching male/female as unknown
recodeSex(ped, code_male = "M", code_female = "F", recode_unknown = "U")
# Sex values "X", "?" automatically recoded to "U"

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.42%. Comparing base (e37cd10) to head (e216d9b).
⚠️ Report is 1 commits behind head on dev_main.

Additional details and impacted files

@@             Coverage Diff              @@
##           dev_main     #107      +/-   ##
============================================
+ Coverage     84.30%   84.42%   +0.12%     
============================================
  Files            25       25              
  Lines          3982     3982              
============================================
+ Hits           3357     3362       +5     
+ Misses          625      620       -5     

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