refactor: remove return type annotations from activity and athlete tools

src/strava_mcp_server/tools/athlete.py

@@ -6,7 +6,7 @@ from strava_mcp_server.utils import format_date_iso, format_date_human
 
 def register(mcp: FastMCP, strava: StravaClient) -> None:
     @mcp.tool()
-    async def get_athlete_profile(ctx: Context) -> list[ContentBlock]:
+    async def get_athlete_profile(ctx: Context):
         """
         Get the authenticated Strava athlete's profile.
         Returns name, city, country, follower count, and other profile details.
@@ -73,7 +73,7 @@ def register(mcp: FastMCP, strava: StravaClient) -> None:
             return [TextContent(type="text", text=error_msg)]
 
     @mcp.tool()
-    async def get_athlete_zones(ctx: Context) -> list[ContentBlock]:
+    async def get_athlete_zones(ctx: Context):
         """
         Get the heart rate and power zones configured for the authenticated athlete.
         Returns zone boundaries for both heart rate and power (if a power meter is configured).
@@ -128,7 +128,7 @@ def register(mcp: FastMCP, strava: StravaClient) -> None:
             return [TextContent(type="text", text=error_msg)]
 
     @mcp.tool()
-    async def get_athlete_stats(ctx: Context) -> list[ContentBlock]:
+    async def get_athlete_stats(ctx: Context):
         """
         Get cumulative training statistics for the authenticated Strava athlete.
         Includes all-time, year-to-date, and recent (4-week) totals for runs, rides, and swims.