v0.3.0

Breaking changes

• Requires pydantic-monty>=0.0.19.
• MountDir arguments are now keyword-only, e.g. MountDir(virtual_path="/data", host_path="./reports", mode="read-only"). This follows the upstream Monty change.
• Overlay mounts no longer persist across execute() calls. Overlay writes live for the duration of one call and are then discarded. Use read-write mode for files that must survive across calls.
• Code now runs in a pool of monty worker subprocesses instead of an in-process interpreter. A crashed worker is replaced without taking down your process.

New features

• A single MontyInterpreter is now safe to share across threads. Each thread gets its own isolated REPL session from one shared worker pool, so dspy.Evaluate and dspy.Parallel with num_threads work with one interpreter instance.
• New max_processes constructor parameter caps live workers in the pool. Set it to at least num_threads when running more threads than CPU cores.
• New request_timeout constructor parameter sets a hard per-execute() time limit in seconds. Code that exceeds it raises CodeInterpreterError, and the next execute() starts with a fresh session.
• A crashed or timed-out worker surfaces as CodeInterpreterError, and the interpreter recovers automatically with a fresh session. A SUBMIT() captured before the crash is still honored.
• Sandbox code can now define classes (new in Monty 0.0.19).
• The unicodedata module is now available in sandbox code.