Normalize beta parameter string aliases before calling downstream functions

[Copilot]

buildWithinGenerations() and buildBetweenGenerations() accept beta = "optimized"/"indexed" but pass these strings to helpers that use if (beta) checks, causing errors.

Changes

• Parameter normalization: Added validation logic in both entry-point functions to convert string aliases to logical values before calling helpers:

  • "optimized" → TRUE
  • "base", "original" → FALSE
  • "index", "indexed" → throw "not yet implemented" error

• Consistency fixes: Made both functions check for unimplemented aliases first, support the same set of string values, and use identical error messages

• Test coverage: Added tests verifying string aliases produce identical results to their boolean equivalents

Example

# These now work identically
simulatePedigree(beta = TRUE)
simulatePedigree(beta = "optimized")

# As do these
simulatePedigree(beta = FALSE)
simulatePedigree(beta = "base")
simulatePedigree(beta = "original")

Downstream functions (createGenDataFrame, determineSex, assignCoupleIDs, adjustKidsPerCouple, markPotentialChildren) now always receive TRUE or FALSE, never strings.

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[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.37%. Comparing base (109e55c) to head (5c43f45).
⚠️ Report is 1 commits behind head on dev_main.

Files with missing lines	Patch %	Lines
R/simulatePedigree.R	81.81%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           dev_main     #111      +/-   ##
============================================
+ Coverage     84.31%   84.37%   +0.06%     
============================================
  Files            27       27              
  Lines          4228     4238      +10     
============================================
+ Hits           3565     3576      +11     
+ Misses          663      662       -1     

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