Re-ground the MRTR origin notes after the MCPServer pass-through landed

MCPServer now passes InputRequiredResult through its prompt and resource
pipelines, so the two origin entries' notes and the matching test
docstrings no longer claim it cannot; the mcpserver mirrors are recorded
as possible and not yet covered. No behaviour or assertion changes - the
full suite is green unchanged against current main.

Author: maxisbey

tests/interaction/_requirements.py

@@ -2240,8 +2240,8 @@ def __post_init__(self) -> None:
         ),
         added_in="2026-07-28",
         note=(
-            "Low-level Server only: MCPServer returns InputRequiredResult from tools alone, so the "
-            "resources/read MRTR leg has no mcpserver mirror."
+            "Driven on the low-level Server; MCPServer now passes InputRequiredResult through its "
+            "resource pipeline as well, so an mcpserver mirror is possible and not yet covered here."
         ),
     ),
     "resources:read:blob": Requirement(
@@ -2756,8 +2756,8 @@ def __post_init__(self) -> None:
         ),
         added_in="2026-07-28",
         note=(
-            "Low-level Server only: MCPServer returns InputRequiredResult from tools alone, so the "
-            "prompts/get MRTR leg has no mcpserver mirror."
+            "Driven on the low-level Server; MCPServer now passes InputRequiredResult through its "
+            "prompt pipeline as well, so an mcpserver mirror is possible and not yet covered here."
         ),
     ),
     # ═══════════════════════════════════════════════════════════════════════════

tests/interaction/lowlevel/test_prompts.py

@@ -271,7 +271,7 @@ async def test_get_prompt_input_required_is_fulfilled_and_the_retry_returns_the_
 
     The retry carries the callback's responses and the echoed request_state, and returns the prompt
     messages. Spec-mandated: prompts/get is an MRTR-supported request (basic/patterns/mrtr, Supported
-    Requests). Low-level Server only — MCPServer cannot return InputRequiredResult from prompts.
+    Requests). Driven on the low-level Server; MCPServer also passes InputRequiredResult through prompts.
     """
     sent = ElicitRequestFormParams(
         message="Who is reading?",

tests/interaction/lowlevel/test_resources.py

@@ -396,7 +396,7 @@ async def test_read_resource_input_required_is_fulfilled_and_the_retry_returns_t
 
     The retry carries the callback's responses and the echoed request_state, and returns the resource
     contents. Spec-mandated: resources/read is an MRTR-supported request (basic/patterns/mrtr, Supported
-    Requests). Low-level Server only — MCPServer cannot return InputRequiredResult from resources.
+    Requests). Driven on the low-level Server; MCPServer also passes InputRequiredResult through resources.
     """
     sent = ElicitRequestFormParams(
         message="Who is reading?",