v0.29.4 — transport="launch"

Adds a 4th Client transport alongside subprocess/http/tcp: Client.from_launch(worker_argv, ...) spawns-or-reuses a warm worker over an AF_UNIX socket via vgi_rpc.launcher, shared across every client on the machine pointing at the same command — the Python client-side counterpart to the VGI DuckDB extension's launch:<argv> LOCATION scheme.

Requires vgi-rpc>=0.43.2 (its new resolve_and_connect, which handles the retry-on-stale-connect race). Install with pip install "vgi-python[launch]".