Bump version to 0.7.0

Access log enrichment: request_data, stream_id, auth fields,
error_message, server_version, request/response state.
Token format v3 (breaking: adds stream_id segment).
Conformance validator CLI.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: rustyconover

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "vgi-rpc"
-version = "0.6.12"
+version = "0.7.0"
 description = "Vector Gateway Interface - RPC framework based on Apache Arrow"
 readme = "README.md"
 requires-python = ">=3.13"