Raise test coverage: Full test suit, contract wrappers, execution, separation

[RBhupi]

PR tags (required)

Select all that apply.

• docs-only
• tests-only
• tiny-change (<5 lines, single class/file)
• code-change
• scientific/algorithmic
• design/architecture
• GUI

What changed

2-4 bullets in plain language.
adds test coverage across every module.

Why

1-2 lines on the user/problem impact.

Issues closed

Closes #10
Closes #11
Closes #12

Target version (required)

Aiming for: v0.2.0

Validation

validated through manual mutation testing.

• I ran ruff

  • Evidence (command + pass/fail):
  • N/A reason (if not run):

• I ran import-linter

  • Evidence (command + pass/fail):
  • N/A reason (if not run):

• I ran tests

  • Evidence (command + pass/fail):
  • N/A reason (if not run):

AI usage & manual verification

If AI tools were used, complete this section.

• AI used: yes
• Model/tooling: Argo + Claude code
• Tasks delegated to AI: developing tests
• Manual verification performed: yes, many tests were checked by breaking the code.

Reviewer guide

Where should review start, and what are the key files/areas?

• Entry point: ./tests

[codecov-commenter]

Codecov Report

❌ Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.63%. Comparing base (2ef40a6) to head (d476648).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/adapt/utils/time.py	86.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #34       +/-   ##
===========================================
+ Coverage   19.88%   46.63%   +26.74%     
===========================================
  Files          49       55        +6     
  Lines        6079     6088        +9     
  Branches      863      860        -3     
===========================================
+ Hits         1209     2839     +1630     
+ Misses       4761     3051     -1710     
- Partials      109      198       +89     

Flag	Coverage Δ
unittests	46.63% <88.23%> (+26.74%)	⬆️

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