[codex] fix docs api correctness

[vvv214]

Summary

This draft PR fixes documentation/API mismatches surfaced while reviewing the public repo.

• update README links from the old documentation/ directory to docs/
• update the in-memory API signature to use the current mechanism type/default
• replace stale AIMConfig(seed=..., rounds=...) example parameters with max_rounds
• clarify the CLI --seed limitation for bit-for-bit reproducibility
• make the record-level DP assumption explicit and warn that multi-row users need caller-enforced contribution bounds

Why

The docs currently reference moved paths and show constructor arguments that are not fields on AIMMechanism. The CLI seed text also overstates reproducibility because the in-memory generator creates a fresh np.random.default_rng() internally.

Validation

• rg -n "documentation/|DiscreteMechanismConfig|seed=42|rounds=50|fixed random seed|bit-for-bit|record-level differential privacy|different \\*\\*privacy unit" README.md docs/in_memory_api.md docs/data_and_terminology.md
  • only returns the newly clarified record-level and bit-for-bit limitation text

Full pytest was not run because this is a docs-only PR.