Add example notebooks

[DavidMStraub]

(fixes #6)

[Copilot]

Pull request overview

Adds Jupyter notebook examples under docs/source/examples to address #6 by providing practical, theory-backed walkthroughs of PathSim-Batt usage (SPMe monolithic simulation, external electrothermal coupling, and DFN co-simulation patterns).

Changes:

• Added an SPMe constant-current discharge example notebook using CellElectrothermal.
• Added an external electrothermal feedback example wiring CellElectrical to LumpedThermal.
• Added a DFN-focused co-simulation notebook demonstrating CellCoSim* blocks and macro-step effects.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
docs/source/examples/01_spme_discharge.ipynb	New SPMe discharge example showing monolithic PathSim integration and plotting of V/T/SOC.
docs/source/examples/02_electrothermal_coupling.ipynb	New external thermal coupling example demonstrating a closed-loop wiring of CellElectrical ↔ LumpedThermal.
docs/source/examples/03_dfn_cosimulation.ipynb	New DFN co-simulation example illustrating DAE-capable co-sim blocks and macro-step accuracy effects.

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