fix: restore numeric vector outputs

[nvphungdev]

Summary

• normalize one-column numeric indicator outputs back to double vectors
• update the generated numeric templates so future wrappers keep the same behavior
• tighten generated numeric tests to reject one-column matrix results while preserving multi-column matrix outputs

Validation

• bash -n codegen/generate_unit-tests.sh
• git diff --check
• rg "is.null\(dim\(x\)\)|numeric methods returns <matrix>" R codegen tests -n (no matches)
• Not run: R/testthat suite; R/Rscript are unavailable in this environment.

Fixes #61

[serkor1]

Hi @nvphungdev ,

Thank you so much for taking the time to submit a (almost mergable) PR. This is highly appreciated.
I have added a few comments that needs to be resolved before it can merged, but they are really minor.

Generally the lookback attribute is meant for the charting API, what is the rationale for adding the attribute in the numeric method? Have I missed something here?

Best,

[nvphungdev]

Hi @serkor1
Thanks, simplified this as suggested. I removed the helper abstraction and inlined the one-column matrix conversion in the numeric templates/generated methods. I also removed the lookback preservation from the numeric output path.

[serkor1]

Awesome! Great work, thank you so much. I will merge the branch ASAP.

[codecov]

Codecov Report

❌ Patch coverage is 96.55172% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.67%. Comparing base (3abdfd2) to head (6c15f8c).

Files with missing lines	Patch %	Lines
R/ta_VOLUME.R	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel      #63      +/-   ##
==========================================
+ Coverage   96.58%   96.67%   +0.09%     
==========================================
  Files         280      280              
  Lines       21012    21012              
==========================================
+ Hits        20294    20314      +20     
+ Misses        718      698      -20     

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