allow CallableModelGenericType to be fully fledged callable model base

[timkpaine]

No description provided.

[github-actions]

Test Results

428 tests  +2   424 ✅ +2   23s ⏱️ ±0s
  1 suites ±0     4 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit df23202. ± Comparison against base commit 5d07635.

[codecov]

Codecov Report

❌ Patch coverage is 88.37209% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.37%. Comparing base (5d07635) to head (df23202).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
ccflow/callable.py	80.00%	1 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #137      +/-   ##
==========================================
- Coverage   95.41%   95.37%   -0.04%     
==========================================
  Files         120      120              
  Lines        6755     6794      +39     
  Branches      427      432       +5     
==========================================
+ Hits         6445     6480      +35     
- Misses        202      203       +1     
- Partials      108      111       +3     

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The merge-base changed after approval.