Fixes a resource leak where the LSP server subprocess was not cleaned up if an
exception occurred after the process was spawned but before start() returned
normally. This could happen if any post-Popen initialization step (e.g., logging)
raised an exception.

The fix wraps all post-Popen initialization code in a try/except block that:
1. Terminates the subprocess on exception
2. Waits for graceful shutdown with timeout
3. Resets self._process to None
4. Re-raises the original exception without suppression

This ensures the subprocess is never left running as a zombie, and the transport
state remains consistent (is_alive returns False, stop() is a no-op).

Closes #7044

@@ -0,0 +1,320 @@
+"""Step definitions for A2A module rename and symbol standardization."""

@@ -0,0 +1,320 @@
+"""Step definitions for A2A module rename and symbol standardization."""

@@ -0,0 +1,320 @@
+"""Step definitions for A2A module rename and symbol standardization."""

@@ -0,0 +1,320 @@
+"""Step definitions for A2A module rename and symbol standardization."""

@@ -0,0 +186,4 @@
+    """Check A2A module documentation."""
+    context.module_doc = a2a_module.__doc__
+    context.class_docs = {}
+    for name, symbol in context.a2a_symbols.items():

@@ -0,0 +254,4 @@
+def step_request_has_id(context):
+    """Verify request has id field."""
+    assert hasattr(context.request, "id")
+    assert context.request.id == 1