Implement identity persistence detection logic in SeedIdentityDetector.js

[blackboxprogramming]

Description

Currently, the SeedIdentityDetector function in lucidia/SeedIdentityDetector.js is unimplemented and contains a TODO【341970565104663†L74-L78】. This task requires implementing a detection algorithm that analyses conversation history or other relevant metrics to infer identity persistence over time.

Proposed work

• Design an algorithm for identity persistence detection. The algorithm should analyse sequences of messages or other metadata to determine whether the same user identity continues across sessions.
• Implement this algorithm in SeedIdentityDetector.js.
• Update the function to return a structured result (e.g., an object or boolean) indicating whether identity is persistent.
• Document the algorithm and usage in code comments.
• Add at least one unit test in Node.js (e.g., with Jest) demonstrating that the detector correctly flags persistent vs. transient identities.

Acceptance criteria

• SeedIdentityDetector no longer contains TODO; it implements the detection logic and returns appropriate results.
• Tests cover both persistent and non‑persistent cases and pass successfully.
• Code is committed to the lucidia repository with clear comments.