PR Review

Overall assessment: ✅ Looks good

Executive summary

• The diff is release metadata only: changelog entry plus version bumps in Python, Rust, and the LLM-facing docs (CHANGELOG.md:L10-L29, diff_diff/__init__.py:L213, pyproject.toml:L7, rust/Cargo.toml:L3, docs/llms-full.txt:L5).
• No estimator implementation, weighting logic, variance/SE computation, identification assumption, or default behavior changed in this PR.
• Version propagation appears complete and internally consistent. Docs build versioning is sourced from diff_diff.__version__ (docs/conf.py:L19-L20), and the Rust extension exports the Cargo package version (rust/src/lib.rs:L58).
• No unmitigated P0/P1 findings. One low-risk documentation-validation gap remains, but it is already tracked in TODO.md:L87 and is not a blocker.

Methodology

No findings.

The changelog mentions methodology-adjacent work for HonestDiD and StaggeredTripleDifference (CHANGELOG.md:L13-L29), but this PR does not modify those implementations. Cross-checking the existing registry entries shows the relevant methodology/deviation documentation already lives in docs/methodology/REGISTRY.md:L1263-L1404 and docs/methodology/REGISTRY.md:L1778-L1827.

Code Quality

No findings.

The version bump is propagated consistently across packaging/runtime surfaces: pyproject.toml:L7, diff_diff/__init__.py:L213, rust/Cargo.toml:L3, and docs/llms-full.txt:L5. The changelog also includes the new compare link at CHANGELOG.md:L1068.

Performance

No findings.

This is a metadata-only PR and does not touch runtime code paths.

Maintainability

No findings.

The version sources remain straightforward and low-drift because Sphinx reads diff_diff.__version__ (docs/conf.py:L19-L20) and the Rust module exports CARGO_PKG_VERSION (rust/src/lib.rs:L58).

Tech Debt

No findings.

This PR does not introduce new deferred work or add untracked release-process debt.

Security

No findings.

No secrets, credentials, network behavior, or executable logic changed in the diff.

Documentation/Tests

• Severity: P3
  Impact: docs/llms-full.txt:L5 was updated manually, and .txt AI guide files are still outside current snippet smoke coverage, which is already tracked in TODO.md:L87. This creates a small documentation-drift risk but does not affect package correctness.
  Concrete fix: None required for approval. Separately, extend tests/test_doc_snippets.py or equivalent coverage to include .txt guide files if CI validation for these docs is desired.