When the verification gate auto-discovers commands from package.json
(typecheck, lint, test), failures on pre-existing errors create a doom
loop: execute → fail → auto-fix → still fails → retry exhausted → pause.
The agent can't fix pre-existing lint/test errors it didn't introduce.
Now, when discoverySource is 'package-json', gate failures are logged
as warnings and the task proceeds without triggering the retry loop.
Explicitly configured checks (via preferences or task plan verify field)
still trigger the full retry cycle.
This preserves the safety of user-configured verification while
preventing auto-discovered checks from blocking on inherited tech debt.
Fixes#1186
c442e2d97e