fix(mcp): keep testgen.testing out of the built wheel; tidy connection docs (TG-1124)

Exclude testgen.testing* from packages.find so the shared test-fixtures module
(which imports pytest at module top) is not packaged into the runtime wheel;
editable dev/CI installs still resolve it from source. Drop the dead testlib*
exclude (no such package). Describe the testgen://connection-parameters resource
by its param shapes rather than enumerating specific tools.

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

Author: rboni-dk

pyproject.toml

@@ -145,7 +145,7 @@ include-package-data = true
 include = [
       "testgen*",
 ]
-exclude = [ "*.tests", "tests*", "deploy*", "invocations*", "testlib*"]
+exclude = [ "*.tests", "tests*", "deploy*", "invocations*", "testgen.testing*"]
 
 [tool.pytest.ini_options]
 minversion = "7.0"

testgen/mcp/tools/reference.py

@@ -410,8 +410,7 @@ def _append_mode(doc: MdDoc, mode: FlavorMode, schema: FlavorSchema, *, url_offe
 
 def connection_parameters_resource(flavor: str) -> str:
     """Per-flavor connection parameter shapes: the auth modes and the exact
-    ``connection_params`` keys (with required/optional + secret notes) used by
-    ``create_connection`` / ``update_connection`` / ``test_connection``.
+    ``connection_params`` keys (with required/optional + secret notes) for the flavor.
 
     Args:
         flavor: Flavor code, e.g. ``snowflake``, ``azure_mssql``, ``salesforce_data360``.