Make the dormant verification primitive enforceable:
- Wire _verification_gate() into run_autonomous(_async): blocking hook
failures block a success outcome and feed captured stdout/stderr back as
feedback; never-passing checks end at max_iterations, not success.
- Fix lossy _run_verification_hooks re-wrap (preserve details/error/duration).
- Add declarative FileCheckHook (exists/non_empty/contains/json_field==equals),
no shell; CommandVerificationHook now accepts a string command.
- Feed the goal judge executable evidence; a failing blocking hook
short-circuits to continue without spending a judge call.
- add_verification()/remove_verification() for runtime registration.
- Add 'verification' run-journal event kind and YAML `verification:` config
parity mapping command:/file: shapes onto the two hook classes.
Opt-in only: agents without verification_hooks are unchanged.
Co-authored-by: MervinPraison <[email protected]>
