release: vgi-python 0.19.0

Minor rather than patch: the attach_opaque_data envelope format changed.
MetaWorker now seals the catalog name into the attach plaintext
(VGI\0MWC\0 || len || name || uuid(16) || catalog_bytes) instead of prefixing a
sub-worker index outside the seal, so an attach minted by 0.18.x is not routable
by 0.19.0 and vice versa. Attaches are process-scoped, but an HTTP state token
held across a rolling upgrade will fail to route rather than resolve to the wrong
catalog.

Dispatch also refuses ambiguity now: when several sub-workers declare the same
function name and the call carries no attach naming the catalog,
MetaWorker raises instead of returning the first declarer.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: rustyconover

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "vgi-python"
-version = "0.18.0"
+version = "0.19.0"
 description = "Vector Gateway Interface - Connect DuckDB to external programs via Apache Arrow"
 readme = "README.md"
 keywords = [