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* feat(e2b-sandbox): make mount upload deadline configurable Replace the hardcoded 120-second mount upload deadline with a configurable `mount_upload_deadline_seconds` key read from SandboxConfig (extra=allow). The value is validated: zero and negative inputs are clamped to 1 second. Omitting the key preserves the existing 120-second default. This addresses the follow-up from PR #4842 review: operators with large mounts or slow networks can now size the deadline to their deployment without changing code. * fix(e2b-sandbox): address review feedback on configurable deadline - Remove import-time default capture from _mount_deadline_reason() and _MountUploadBudget.deadline_seconds to prevent silent drift. - Add warning log when mount_upload_deadline_seconds is clamped to 1 (was silent before). - Update AGENTS.md E2B Mount Uploads section: deadline is now configurable, not fixed 120. - Add mount_upload_deadline_seconds to YAML examples in provider docstring and __init__.py. - Add config-path test that exercises SandboxConfig -> _load_config -> _apply_mounts end-to-end. * feat(e2b-sandbox): surface structured mount upload result on sandbox Introduce MountUploadResult dataclass and attach it to E2BSandbox.mount_upload_result after creation. This makes mount truncation observable in code without re-parsing Gateway logs. _apply_mounts() now returns MountUploadResult with truncated, reason, and upload totals. _create_sandbox() captures the result, stores it on the sandbox instance, and records it in a provider-level map so the result survives warm-pool reclaim and reconnect. MountUploadResult.truncated is True only when the upload pass was stopped early by a resource limit (deadline, file count cap, or byte budget). Individual mount failures (missing host path, SDK errors) are logged but do NOT set truncated. Tests cover: success totals, deadline truncation, file-count truncation, byte-budget truncation, non-limit failure not reported as truncation, missing host path not reported as truncation, create→sandbox wiring, and create→release→warm-pool→acquire result preservation. * fix(e2b-sandbox-provider): fix _mount_results lifecycle leak and review findings - Add _forget_mount_result() helper and call it at all terminal sandbox paths: _reuse_in_process_sandbox dead-evict, _reclaim_warm_pool_sandbox reconnect/dead/bootstrap/ownership/shutdown failure branches, _forget_local_sandbox, _kill_and_close. Prevents unbounded dict growth over a long-running Gateway process. - Make MountUploadResult @dataclass(frozen=True) to prevent silent mutation of the shared reference between provider map and sandbox attribute. - Move _mount_results insert under self._lock in _create_sandbox to match the read discipline in _register_connected_sandbox. - Guard _resolve_mount_upload_deadline against None (YAML explicit null) to avoid int(None) TypeError. - Add 5 regression tests covering each bypass path and the frozen invariant. * fix(e2b-sandbox-provider): add _forget_mount_result to _evict_oldest_warm branches Add _forget_mount_result() calls to all four terminal exit paths in the E2B _evict_oldest_warm override (reconnect failure, already-gone, kill failure, kill success). The peer-owned path already cleans up via _forget_local_sandbox. Add test_evict_oldest_warm_cleans_mount_result to pin the kill-success branch. * docs: reduce agent guidance size --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>