[BOUNTY] Add deterministic seed support to data_generator.py (#4)

[leo202000]

Summary

Makes DataGenerator fully deterministic by routing all randomness through the seeded random.Random instance, addressing bounty #4. The existing seed parameter now guarantees identical output across runs.

Changes

• tools/data_generator.py:
  • Module-level helpers (random_phone, random_email, random_datetime, gaussian_random) now accept an optional rng argument so callers can inject a seeded generator.
  • DataGenerator passes self.random to every helper call site in generate_users, generate_orders, and generate_trades, closing the gap where email/phone/datetime/timestamp used the unseeded global random.
  • Added a DataGenerator class docstring documenting seed-based reproducibility.
• tests/test_data_generator_seed.py: 11 unit tests verifying same-seed reproducibility (users/orders/trades), seed differentiation, cross-run stability, default seed, and helper-level rng injection.
• diagnostic/build-23f043a7.logd + .json: required diagnostic bundle.

Testing

• python3 tests/test_data_generator_seed.py -v -> 11 tests pass.
• python3 build.py -> diagnostic bundle generated and committed (diagnostic/build-23f043a7.logd, 15044 bytes, DIAG magic).
• Smoke test: DataGenerator(seed=42) produces byte-identical users across two instances; different seeds produce different data.

Checklist

• Relevant modules affected by these changes build locally
• Tests pass locally
• Diagnostic build log is committed in this PR
• Documentation has been updated, if applicable
• Configuration or schema changes are documented, if applicable
• No generated build artifacts are committed, except the required diagnostic build log
• Changes are scoped to the PR purpose and avoid unrelated cleanup
• Security, privacy, and error-handling implications have been considered

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• I would like to request that my diagnostic build log is removed before merging

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Addresses bounty issue #4. Please let me know the process for claiming the $25 bounty once merged.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6ae9cdc2-0d80-4ed7-a2ad-650a129334ca

📥 Commits

Reviewing files that changed from the base of the PR and between 94e0fb0 and 1016565.

📒 Files selected for processing (4)

• diagnostic/build-23f043a7.json
• diagnostic/build-23f043a7.logd
• tests/test_data_generator_seed.py
• tools/data_generator.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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