🧪 testing improvement: Add tests for assert_legal_state

[undivisible]

🎯 What: This PR adds unit tests for assert_legal_state in src/model.rs. The function was missing tests but is crucial for validating memory states.

📊 Coverage: The new tests cover:

• Valid state combinations (e.g. ShortTerm + Accepted + Pending, LongTerm + Accepted + Processed)
• Invalid state combinations like Archive + Superseded + Processed
• Invalid state combinations like LongTerm + Accepted + Pending

✨ Result: Test suite is expanded by three new tests specifically ensuring assert_legal_state correctly passes valid memory configurations and rightfully errors out on invalid ones.

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PR created automatically by Jules for task 8687313724109218814 started by @undivisible

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Note

Low Risk
Test-only addition with no changes to production validation or memory state logic.

Overview
Adds unit tests for assert_legal_state in src/model.rs, covering both legal combinations (ShortTerm/Pending, LongTerm/Processed) and illegal ones (Archive+Superseded, LongTerm+Pending).

No production logic changes—only test coverage for existing validation rules.

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[google-labs-jules]

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(requestId: serverGenReqId_2290e637-f6aa-469e-9447-e739da719d21)

[undivisible]

Superseded by the reviewed and merged integration in #22.

[google-labs-jules]

Superseded by the reviewed and merged integration in #22.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.