chore: 0.29.2 — client support for splits, multi-branch, cache metadata, time travel

Tagged so downstream pins (vgi-polars' VGI_PYTHON_REF) can pick up
Client.table_function_plan/split_tokens, Client.table_scan_branches_get,
Client.table_function(batch_metadata_callback=...), and Client.table_get/
table_function(at_unit=..., at_value=...) — all additive Client-side
methods/params exposing wire capabilities the reference client hadn't
caught up to yet (see 724b19c, f7f13a8). Protocol unchanged at 1.4.0.

No PyPI publish: release.yml fires on a published GitHub Release, not on a
tag push.

Author: rustyconover

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "vgi-python"
-version = "0.29.1"
+version = "0.29.2"
 description = "Vector Gateway Interface - Connect DuckDB to external programs via Apache Arrow"
 readme = "README.md"
 keywords = [