docs(plugin-development): enhance creation of rules for generating custom_experiments with agents

[VassilisVassiliadis]

I used Bob to automatically create a custom experiment via this prompt:

Implement a custom experiment for https://en.wikipedia.org/wiki/Greenberger%E2%80%93Horne%E2%80%93Zeilinger_state using qiskit.

Do not deviate from the instructions and rules outlined in @/.cursor 

Place the custom experiment in the root directory of this git repository in a folder called `ghz-state`

I ran into a couple of problems:

• invalid pyproject.toml file (double check this)
• invalid signature of the custom experiment python function
• invalid use of ranges for the parameters to the experiment python function
• superfluous code validating the inputs to the custom experiment
• illegal fields in the dictionary that the custom experiment returns
• illegal value types in the dictionary that the custom experiment returns
• invalid invocation of the run_experiment command to test the experiment

This PR fixes all but

invalid invocation of the run_experiment command to test the experiment

Bob successfully used ado create space --dry-run and ado create operation --dry-run on DiscoverySpace and Operation files it autogenerated so I don't think there's a big reason to add rules just for running run_experiment at this point.

With the updated rules in this PR the prompt guides Bob to automatically generate a custom experiment with no human intervention that works.

[VassilisVassiliadis]

@michael-johnston I changed this line in my PR

[VassilisVassiliadis]

I need to find out:

• why didn't it run any unit tests ?
• minimum rules that eventually guide the coding assistant to build a working custom_experiment