The runner hardcoded a 3h per-job timeout. Surface it as
services.hyperhive.forge.ci.jobTimeout so a stuck or runaway job is
bounded by a sane default while staying overridable for operators who
legitimately run longer jobs.
Default drops to 1h (comfortably covers a cold-cache nix build while
bounding a hang far sooner than the old 3h); raise it via the option
for genuinely long jobs. Accepts a Go duration string.
Resolves the stuck-runner concern from the CI-outage follow-up with a
runner-enforced job timeout rather than an external watchdog, per
operator direction.
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