v0.46.1

Fix gzip external results served by the in-process demo blob store. GET and HEAD responses now advertise only the standard Content-Encoding header, preventing a second decompression attempt after an HTTP client has already decoded the body.

This patch retains wire contract 2.2.0 under vgi.v2. Workers and native/WASM clients must use matching wire minor versions (2.2); no wire contract or production catalog publication behavior changes.

Validation: all 17 demo-storage tests passed, lint/type checks passed, wheel/sdist metadata checks passed, and a clean installed wheel using published vgi-rpc==0.52.0 passed automatic gzip externalization, catalog discovery, and query execution against signed native extension 437d3b6.

The companion fixture wheel and container images are versioned 0.46.1. Standalone vgi-fixtures PyPI publication remains disabled; fixture modules continue to ship in the vgi-python wheel.