chore(spec): rst -> md for MPT

[SamWilsn]

🗒️ Description

Claude-generated documentation for the MPT.

Cute Animal Picture

[codecov]

Codecov Report

❌ Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.60%. Comparing base (5cdb055) to head (24bc9c2).
⚠️ Report is 1 commits behind head on forks/amsterdam.

Files with missing lines	Patch %	Lines
src/ethereum/merkle_patricia_trie.py	0.00%	11 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##           forks/amsterdam    #2814      +/-   ##
===================================================
- Coverage            88.62%   88.60%   -0.03%     
===================================================
  Files                  577      577              
  Lines                35659    35670      +11     
  Branches              3490     3490              
===================================================
  Hits                 31604    31604              
- Misses                3492     3503      +11     
  Partials               563      563              

Flag	Coverage Δ
unittests	88.60% <0.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.