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* fix(sandbox): enforce E2B replica capacity limits (in-process) Add SandboxCapacityExceededError with diagnostic fields. Add overflow_policy (wait/reject/burst), acquire_timeout, and burst_limit config options. Implement atomic capacity reservation with a four-slot model: reserved / active / warm / transitioning. Transitioning slots close the window where active-to-warm or warm-to-active transitions appear to have zero occupied slots, which would let concurrent acquires exceed the configured replica ceiling. Re-route release, reclaim, and evict through transitioning counters. Add shutdown guard: reject waiters, kill VMs created during shutdown. Add 14 tests: policy enforcement, release+acquire race, warm-reclaim race, shutdown-waiter interaction, shutdown-during-create, and concurrent different-thread capacity assertion. Related: #4339 * fix: harden e2b sandbox capacity lifecycle * fix: retain e2b capacity during uncertain eviction * fix: serialize e2b tombstone eviction * fix: retain capacity after uncertain e2b cleanup * fix: track e2b remote operations during shutdown * fix(sandbox): validate E2B capacity config * fix(sandbox): classify capacity errors * fix(sandbox): harden E2B capacity lifecycle * test(sandbox): cover E2B review findings * docs(changelog): note E2B capacity behavior * docs(readme): explain E2B overflow handling * docs(backend): record E2B lifecycle rules * docs(sandbox): clarify destructive E2B reset * fix(sandbox): close E2B capacity race gaps --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>