Re-organize Changelog for 0.45

[kevalmorabia97]

What does this PR do?

Changelog New Features for 0.45.0 were too clutterred hence splitting into sub-sections for better readability

Summary by CodeRabbit

• Documentation
  • Updated comprehensive release notes for versions 0.46 and 0.45, featuring documentation for agents, speculative-decoding training, quantization enhancements, Megatron framework examples, dataset/calibration improvements, and additional tooling.
  • Enhanced guidance on utilizing model-specific recipes to configure quantization settings tailored for different model types.
  • Reorganized deprecation notices for improved clarity.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 0717d2e2-adbd-4405-a265-7f2a33009ecc

📥 Commits

Reviewing files that changed from the base of the PR and between 55a2101 and 431ef66.

📒 Files selected for processing (1)

• CHANGELOG.rst

---

📝 Walkthrough

Walkthrough

CHANGELOG.rst is updated with expanded release notes for versions 0.46 and 0.45, adding New Features entries covering quantization, Megatron framework, and tooling. Model-specific PTQ recipe path guidance is added, the Step3.5-Flash YAML path is updated, and the QuantizationArgumentsWithConfig deprecation notice is relocated into the updated Deprecations section.

Changes

CHANGELOG Release Notes Update

Layer / File(s)

Summary

0.46/0.45 release sections and deprecation relocation CHANGELOG.rst

Expands 0.46 and 0.45 New Features with quantization, Megatron framework, dataset/calibration, and tooling items; adds model-specific PTQ quant_cfg migration notes pointing to modelopt_recipes/huggingface/<model_type>/ptq/; updates the Step3.5-Flash recipe YAML path; and moves the QuantizationArgumentsWithConfig deprecation notice into the repositioned Deprecations section, removing its prior standalone location.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Re-organize Changelog for 0.45' accurately describes the main objective of the pull request, which is to reorganize and restructure the changelog for version 0.45 to improve readability.
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.
Security Anti-Patterns	✅ Passed	PR is a documentation-only change to CHANGELOG.rst with no Python code modifications. All 1102 Python files in this commit are additions (new files), not changes, and the check applies to modelopt...

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch kmorabia/reorg-0.45-changelog

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.10%. Comparing base (55a2101) to head (34d0e9a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1737   +/-   ##
=======================================
  Coverage   77.10%   77.10%           
=======================================
  Files         511      511           
  Lines       56260    56260           
=======================================
  Hits        43380    43380           
  Misses      12880    12880           

Flag	Coverage Δ
unit	54.39% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.