Expand fetch_instructions to include more details about custom modes

[iamhenry]

Right now the modes get access to the first sentence of all of the other modes' role definitions. We should probably think more deeply about this, but in the meantime you might try cramming a little more info in before the first period. - MrUbens

is there a way to have the orchestrator read the instructions from the mode before assigning the sub task?

i'm finding that orchestrator is assining a scope (which is great) but it doesnt take into account the instructions of the mode that will be working on that task

eg. orchestrator is assigning tasks to red phase mode (my tdd workflow) but it missing the instructions that are part of the red phase custom mode