Pin elicitation resolver tests to legacy mode for 2026-07-28 default

After merging main, LATEST_PROTOCOL_VERSION is 2026-07-28, which defines no
server-to-client requests, so elicitation/create is unavailable at the
default negotiated version. Pin these tests to mode='legacy' (negotiates
2025-11-25) where elicitation is supported, matching test_elicitation.py.

Author: Kludex

tests/server/mcpserver/test_resolve.py

@@ -65,7 +65,7 @@ async def whoami(login: Annotated[Login, Resolve(login)]) -> str:
     async def never(context: ClientRequestContext, params: ElicitRequestParams) -> ElicitResult:  # pragma: no cover
         raise AssertionError("should not elicit")
 
-    async with Client(mcp, elicitation_callback=never) as client:
+    async with Client(mcp, mode="legacy", elicitation_callback=never) as client:
         assert await _text(client, "whoami", {}) == "from-resolver"
 
 
@@ -80,7 +80,7 @@ async def login(ctx: Context) -> Login | Elicit[Login]:
     async def whoami(login: Annotated[Login, Resolve(login)]) -> str:
         return login.username
 
-    async with Client(mcp, elicitation_callback=_accept({"username": "octocat"})) as client:
+    async with Client(mcp, mode="legacy", elicitation_callback=_accept({"username": "octocat"})) as client:
         assert await _text(client, "whoami", {}) == "octocat"
 
 
@@ -101,7 +101,7 @@ async def whoami(
             case _:  # pragma: no cover - accepted in this test
                 return "no username"
 
-    async with Client(mcp, elicitation_callback=_accept({"username": "octocat"})) as client:
+    async with Client(mcp, mode="legacy", elicitation_callback=_accept({"username": "octocat"})) as client:
         assert await _text(client, "whoami", {}) == "hi octocat"
 
 
@@ -120,7 +120,7 @@ async def whoami(
             return "declined gracefully"
         raise NotImplementedError
 
-    async with Client(mcp, elicitation_callback=_decline) as client:
+    async with Client(mcp, mode="legacy", elicitation_callback=_decline) as client:
         assert await _text(client, "whoami", {}) == "declined gracefully"
 
 
@@ -135,7 +135,7 @@ async def login(ctx: Context) -> Login | Elicit[Login]:
     async def whoami(login: Annotated[Login, Resolve(login)]) -> str:
         raise NotImplementedError  # pragma: no cover - never reached
 
-    async with Client(mcp, elicitation_callback=_decline) as client:
+    async with Client(mcp, mode="legacy", elicitation_callback=_decline) as client:
         result = await client.call_tool("whoami", {})
         assert result.is_error
         assert isinstance(result.content[0], TextContent)
@@ -168,7 +168,7 @@ async def callback(context: ClientRequestContext, params: ElicitRequestParams) -
         assert "Star modelcontextprotocol/python-sdk as octocat?" in params.message
         return ElicitResult(action="accept", content={"ok": True})
 
-    async with Client(mcp, elicitation_callback=callback) as client:
+    async with Client(mcp, mode="legacy", elicitation_callback=callback) as client:
         text = await _text(client, "star_repo", {"repo": "modelcontextprotocol/python-sdk"})
         assert text == "starred modelcontextprotocol/python-sdk as octocat"
 
@@ -198,7 +198,7 @@ async def callback(context: ClientRequestContext, params: ElicitRequestParams) -
             return ElicitResult(action="accept", content={"username": "octocat"})
         return ElicitResult(action="accept", content={"ok": True})
 
-    async with Client(mcp, elicitation_callback=callback) as client:
+    async with Client(mcp, mode="legacy", elicitation_callback=callback) as client:
         assert await _text(client, "star_repo", {}) == "octocat:True"
     assert elicit_count == 1
 
@@ -217,7 +217,7 @@ async def whoami(login: Annotated[Login, Resolve(login)]) -> str:
     async def never(context: ClientRequestContext, params: ElicitRequestParams) -> ElicitResult:  # pragma: no cover
         raise AssertionError("should not elicit")
 
-    async with Client(mcp, elicitation_callback=never) as client:
+    async with Client(mcp, mode="legacy", elicitation_callback=never) as client:
         assert await _text(client, "whoami", {}) == "sync-user"