Release 4.0

[MMelQin]

Summary by CodeRabbit

• New Features

  • Default CUDA 13 support with updated packages
  • Improved decoding of compressed images

• Documentation

  • Added comprehensive release notes for version 4.0.0
  • Documented Holoscan SDK/CLI compatibility requirements

• Chores

  • Version bumped to 4.0.0

[coderabbitai]

Walkthrough

This pull request bumps the project version to 4.0.0 and adds corresponding release notes. The configuration version is updated, release notes documentation structure is integrated into the Sphinx index, and a new v4.0.0 release notes file documents key changes including CUDA 13 default usage, Holoscan SDK/CLI version constraints, and improved image decoding via nvImageCodec.

Changes

Version 4.0.0 Release

Layer / File(s)	Summary
Version configuration bump .bumpversion.cfg	current_version updated from 3.5.0 to 4.0.0 in bumpversion configuration.
Release notes documentation docs/source/release_notes/index.md, docs/source/release_notes/v4.0.0.md	Sphinx toctree added under "Version 4.0" heading with v4.0.0 entry, and new v4.0.0 release notes file added documenting CUDA 13 defaults, Holoscan SDK/CLI dependency pins below 4.3.0, nvImageCodec improvements, and reference links.

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Release 4.0' directly and accurately describes the main change: a version release from 3.5.0 to 4.0.0 across all modified files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch mq/release_4.0

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/source/release_notes/v4.0.0.md`:
- Around line 5-11: Update the release note phrasing and capitalization:
hyphenate "CUDA version-dependent" in the first bullet, reword "the key
dependencies if this SDK" (reference "Holoscan SDK" and "Holoscan CLI" bullet)
to a clearer phrase such as "the key dependencies for this SDK", ensure "Github"
is capitalized as "GitHub" in both link anchor texts ("closed issues on GitHub"
and "closed pull requests on GitHub"), and verify consistent capitalization of
product names like "nvImageCodec" and "CUDA 13" for clarity.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a074a2fd-2b2e-4ff0-96fe-fa93c940b023

📥 Commits

Reviewing files that changed from the base of the PR and between 9871a3f and c738338.

📒 Files selected for processing (3)

• .bumpversion.cfg
• docs/source/release_notes/index.md
• docs/source/release_notes/v4.0.0.md