chore: prepare for release v0.19.0

[github-actions]

🚀 Release v0.19.0

This PR was automatically created by the release workflow.

Changes included:

• ✅ Updated version to v0.19.0
• ✅ Updated CHANGELOG.md with latest changes
• ✅ Updated version references in README.md

---

After merging this PR, a tag will be created and a GitHub release will be published.

[greptile-apps]

Greptile Overview

Greptile Summary

This PR prepares the repository for the v0.19.0 release by updating version numbers and documentation. The changes include version bumps in pyproject.toml (from 0.18.0 to 0.19.0), comprehensive release notes in CHANGELOG.md, and updated documentation references in README.md.

Key changes:

• Version number correctly updated across all three files
• CHANGELOG includes 33 entries covering features, bug fixes, documentation, and CI improvements
• Release date is set to 2025-11-28 (today)
• All changes follow the standard release preparation pattern

The changes are minimal, focused, and consistent with automated release workflows. No logical issues or bugs detected.

Confidence Score: 5/5

• This PR is safe to merge with no risks - it's a standard automated release preparation
• Perfect score reflects that this is a routine, automated release preparation PR with only version number and documentation updates. All changes are consistent, properly formatted, and follow established patterns. No code logic changes, no breaking changes, and no potential runtime issues.
• No files require special attention - all changes are standard release preparation updates

Important Files Changed

File Analysis

Filename	Score	Overview
pyproject.toml	5/5	Version bumped from 0.18.0 to 0.19.0 - change is correct and consistent
CHANGELOG.md	5/5	Added v0.19.0 release notes with proper formatting and comprehensive change list
README.md	5/5	Updated version reference from 0.18.0 to 0.19.0 in documentation banner

Sequence Diagram

sequenceDiagram
    participant GHA as GitHub Actions
    participant Workflow as Release Workflow
    participant Files as Repository Files
    participant Tag as Git Tag System
    
    GHA->>Workflow: Trigger release workflow
    Workflow->>Files: Update pyproject.toml version
    Files-->>Workflow: Version updated to 0.19.0
    Workflow->>Files: Update CHANGELOG.md
    Files-->>Workflow: Release notes added
    Workflow->>Files: Update README.md version reference
    Files-->>Workflow: Documentation updated
    Workflow->>GHA: Create PR #1519
    Note over GHA,Workflow: After PR merge
    Workflow->>Tag: Create v0.19.0 tag
    Workflow->>GHA: Publish GitHub release

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[greptile-apps]

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[github-actions]

Documentation preview

https://nvidia-nemo.github.io/Guardrails/review/pr-1519

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!