docs: wrap metadata docstrings to 80-char line limit

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: donggyun112

src/google/adk/agents/invocation_context.py

@@ -263,9 +263,10 @@ class InvocationContext(BaseModel):
   """Per-request metadata passed from Runner entry points.
 
   This field allows passing arbitrary metadata that can be accessed during
-  the invocation lifecycle, particularly in callbacks like before_model_callback.
-  Common use cases include passing user_id, trace_id, memory context keys, or
-  other request-specific context that needs to be available during processing.
+  the invocation lifecycle, particularly in callbacks like
+  before_model_callback. Common use cases include passing user_id, trace_id,
+  memory context keys, or other request-specific context that needs to be
+  available during processing.
 
   Supported entry points: run(), run_async(), run_live(), run_debug().
   """

src/google/adk/runners.py

@@ -1606,7 +1606,7 @@ async def run_live(
         run_config: The run config for the agent.
         session: The session to use. This parameter is deprecated, please use
           `user_id` and `session_id` instead.
-        metadata: Optional per-request metadata that will be passed to callbacks.
+        metadata: Optional per-request metadata passed to callbacks.
 
     Yields:
         AsyncGenerator[Event, None]: An asynchronous generator that yields
@@ -1816,7 +1816,7 @@ async def run_debug(
           shown).
         verbose: If True, shows detailed tool calls and responses. Defaults to
           False for cleaner output showing only final agent responses.
-        metadata: Optional per-request metadata that will be passed to callbacks.
+        metadata: Optional per-request metadata passed to callbacks.
 
     Returns:
         list[Event]: All events from all messages.