Fix mcp response payload

[msm1992]

Updated MCP response payload to conform to jsonrpc format.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 9.67%. Comparing base (cea3503) to head (71413ad).
⚠️ Report is 77 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13887      +/-   ##
============================================
+ Coverage      9.13%    9.67%   +0.53%     
- Complexity      633      676      +43     
============================================
  Files           327      335       +8     
  Lines         16144    16537     +393     
  Branches       1739     1783      +44     
============================================
+ Hits           1475     1600     +125     
- Misses        14651    14914     +263     
- Partials         18       23       +5     

Flag	Coverage Δ
integration_tests	9.67% <ø> (+0.53%)	⬆️

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