feat(agents): extract_self_belief parser for find-your-body SELF: reports

refactor: restructure proteus into game/web subpackages

feat(cp5): HumanAgent probe path returns typed ProbeResult

feat(cp5): HumanAgent act path + WASD parsing + reprompt (I/O-injected)

feat(cp4.5): preserve probe reasoning + raw_text + token accounting via ProbeResult

feat(cp4.5): persist act-call token accounting + raw_text in TurnTrace

fix(cp2): VanillaAgent parses action from think-stripped answer (ignore in-think decoys)

feat(cp2): VanillaAgent (act + probe, reasoning capture)

feat(cp2): Agent ABC + ActResult

fix(cp2): extract_action handles punctuation-wrapped field tokens (e.g. 'up?')

feat(cp2): slim action parser