fetchTimeout

Upper bound on a single lazy fetch. A fetch suspends until some peer serves the bytes; if none does within this window the us.tractat.kuilt.warp.WarpNode treats it as transient — it stands the task by (unclaims it, records no result) so anti-entropy re-evaluates on a later cycle, rather than hanging forever holding the claim. A timeout is never terminal: an absent bobbin may simply be in flight from a peer that has not finished joining. The default (30 s) sits well above the per-op execution timeout (1 s) and the claim settle window (500 ms) so a transiently-slow holder is not abandoned prematurely, yet well below any horizon at which a permanently-missing bobbin should keep a task claimed. Drives kotlinx.coroutines.withTimeoutOrNull, so it honours virtual time.