Adding a variation of KorakianitisMixedModel with passive component

[LevanBokeria]

This pull request incorporates a new model instantiated by @MaxBalmus which is a variation of KorakianitisMixedModel. From Max:

A new model proposed as an alternative to KorakianitisMixedModel called KorakianitisMixedModel_PP (preserved pressure). It uses a slightly modified chamber model HC_mixed_elastance_pp, which modifies the total pressure from the form:
p(t,v) = [1-a(t)] * p_pas(v) + a(t) * p_act(v)
to:
p(t,v) = p_pas(v) + a(t) * p_act(v)
This new format prevents the pressure during contraction from being lower than the passive equivalent.

The PR also includes tests for this new model.

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Pull Request Overview

This PR introduces a new model variant, KorakianitisMixedModelPP, which implements a modified passive pressure formulation along with its corresponding tests and expected outputs. Key changes include:

• Adding a new model in src/ModularCirc/Models/KorakianitisMixedModelPP.py that leverages a modified HC_mixed_elastance_pp component.
• Including a new HC_mixed_elastance_pp component in src/ModularCirc/Components/HC_mixed_elastance_pp.py to compute total pressure using the updated formulation.
• Updating tests, expected output files, and notebooks to support and validate the new model variant.

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_KorakianitisMixedModelPP.py	Added comprehensive tests for the new model variant and its solver configuration.
tests/expected_outputs/KorakianitisMixedModelPP_expected_output.json	Contains expected output values for various solver step sizes.
src/ModularCirc/Models/KorakianitisMixedModelPP.py	Implements the new model variant with modified initialization and component connections.
src/ModularCirc/Components/HC_mixed_elastance_pp.py	Provides the modified component that computes total pressure per the new design.
src/ModularCirc/Components/init.py	Updated to import and expose the new HC_mixed_elastance_pp component.
sandbox/notebooks/generate_KMM_KGO.ipynb & generate_KMMPP_KGO.ipynb	Notebooks updated to generate known good outputs for the new model variant.

Comments suppressed due to low confidence (1)

src/ModularCirc/Models/KorakianitisMixedModelPP.py:27

• The attribute self.name does not reflect that this is the PP variation; consider renaming it to 'KorakianitisMixedModelPP' for consistency.

self.name = 'KorakianitisModel'

[MaxBalmus]

All good as far as I can see.