testing and docs updates

[nmstone]

Added a GH action to auto run tests on commits.

@airabino There are a few tweaks to the modeling code for incoming inconsistency (handle/id). Could also just be misunderstanding. also some init stuff that i tweaked to get tests working, i think theses are safe but would like extra eyes in case i missed something obvious

having trouble understanding this issue from implementing the pypsa tests (https://github.com/ucdavis/good_model/actions/runs/13527537624/job/37801761757) - which are passing, but with some hacks. when we use realistic (positive) operating costs for generators, the model chooses to use wastage instead of generation to meet the load. i think it may be a constraint thing? where wastage is this free source of energy?

for other PyPSA based tests, i hacked a negative wastage costs to encourage generation, or positive wastage costs to discourage wastage, which both work but yeah are hacks

i think we may need to do some or all of the following

• have zero or small positive wastage cost
• energy balance constraints that ensure wastage only occurs when there's excess generation
• have a high shortfall cost to make unserved energy expensive

or am i just not understanding something fundamental?