chore: finalize v0.5.0 release documentation

[suneelprojects]

Summary

Finalizes the v0.5.0 release documentation for the completed grounded AI narrative feature.

• Marks v0.5.0 as released while preserving v0.4.0 release history
• Replaces the v0.4.0 release notes with accurate v0.5.0 grounded-narrative release notes
• Documents provider-neutral narrative generation, the optional OpenAI adapter, evidence citation requirements, integrity validation, workflow fingerprint binding, and human-review limitations
• Adds release-readiness assertions that align the changelog, README, release notes, and authoritative package version

The package version remains 0.5.0. No narrative implementation, public API, dependency metadata, or unrelated code changed.

Exact file scope

• CHANGELOG.md
• README.md
• RELEASE_NOTES.md
• ROADMAP.md
• architecture/06_Agentic_EDA_Roadmap.md
• tests/test_release_readiness.py

Validation

Run from commit 399dc3d3e9aa8f99533237595907cd0940d1330c, based directly on b634eb774cfbd43ed50f0467be5843fa3dba196b:

• python -m pytest — 194 passed, 1 skipped in 16.96s
• ruff check . — passed
• black --check . — passed; 177 files unchanged
• python -m build — passed
  • eazydatafix-0.5.0.tar.gz
  • eazydatafix-0.5.0-py3-none-any.whl
• git diff --check — passed
• python -m twine check dist/* — passed for all 0.3.0, 0.4.0, and 0.5.0 wheel and source artifacts present in dist/
• Stale-status search — no release documentation calls v0.5.0 in development, planned, or unreleased

The skipped test is the environment-dependent optional Parquet test.