fix: resolve ty no-matching-overload on Sandbox.kill()

[beran-t]

Summary

• Fixes ty type checker reporting error[no-matching-overload] when calling Sandbox.kill() (and all other methods using the class_method_variant pattern)
• Single 2-line change: make class_method_variant inherit from Generic[T] instead of object

Problem

The class_method_variant descriptor uses cast(T, self) to tell type checkers that the decorator preserves the original function's type. Without Generic[T], T is only a method-level TypeVar — ty doesn't trust the cast and fails to resolve overloads at call sites. mypy and pyright are more lenient and accept it either way.

Affected methods (both Sandbox and AsyncSandbox): kill, connect, set_timeout, get_info, get_metrics, beta_pause.

Fix

Adding Generic[T] makes T a class-level type parameter, so ty can track the type binding through the descriptor (class_method_variant[(self, **opts) -> bool]). The cast then makes sense to all three type checkers.

Verification

Tested with a consumer repro (sandbox.kill()) against:

Type Checker	Before	After
ty 0.0.15	error[no-matching-overload]	All checks passed
mypy 1.19.1	All checks passed	All checks passed
pyright 1.1.408	All checks passed	All checks passed

Test plan

• Verified ty check passes on consumer-side repro
• Verified mypy and pyright still pass (no regressions)
• Verified Python syntax is valid
• No runtime behavior change (Generic[T] only affects type-level metadata)
• Existing SDK tests (require E2B API credentials)

[changeset-bot]

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Latest commit: f66b494

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[mishushakov]

add changeset and merge/release please