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Discovery limits bound what indexing accepts, not what it then costs. A repository well inside those bounds can still exhaust the host through parser memory, or simply never finish, and a supervised worker that hangs leaves the parent waiting with nothing to report. Add index_max_rss_mb and index_max_duration_seconds, enforced by the parent against the worker process tree rather than the worker process alone, so a runaway child cannot hide behind a small parent. Resident memory is sampled through the platform interface on macOS, Linux and Windows. Crossing a limit terminates the tree and yields one trusted, structured terminal result that attributes the failure to the resource that caused it. Both limits default to off. A measurement that cannot be taken fails the attempt instead of passing it: a watchdog that quietly stops watching is worse than no watchdog at all. The shell fixture that stands in for the supervisor names the two new keys. The worker accepts only a policy that spells out every key it knows, which is what keeps a stale supervisor from starting a worker it cannot bound. Signed-off-by: 刘冲 <mail@liuchong.dev>