test: add session memory summary replay consistency harness

[LiMelson]

Fixes #89

What

• Add a reusable Session / Memory / Summary replay consistency harness.
• Compare InMemory and SQLite replay snapshots.
• Generate normalized diff reports with backend, case, field path, event index, and values.
• Cover injected inconsistency detection for replay cases and summary loss, overwrite, and wrong session ownership.

Test

• pytest tests/sessions/test_replay_consistency.py

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main        #176   +/-   ##
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  Coverage        ?   87.55698%           
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  Files           ?         467           
  Lines           ?       44097           
  Branches        ?           0           
==========================================
  Hits            ?       38610           
  Misses          ?        5487           
  Partials        ?           0           

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[LiMelson]

I have read the CLA Document and I hereby sign the CLA

[LiMelson]

Updated the PR to include Redis replay integration coverage.

Additional verification:

• pytest tests/sessions/test_redis_session_service.py -q
• TRPC_REPLAY_REDIS_URL=redis://localhost:6379/0 pytest tests/sessions/test_replay_consistency.py -q

The generated diff report now includes in_memory, sqlite, and redis backends.