docs: update readme post 0.5

[euronymous-aithal]

reflect 0.5 changes

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Summary by CodeRabbit

• Documentation
  • Updated README with Release v0.5.0 announcement including Docker container availability.
  • Added new features including On-Policy Distillation, Speculative Decoding, and Muon Optimizer support.
  • Expanded model and algorithm support coverage.
  • Refreshed Table of Contents and quick-start references.

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📝 Walkthrough

Walkthrough

This PR updates the README.md documentation to reflect version 0.5.0 release information, reorganizes the features section with entries for new capabilities (Muon Optimizer, SGLang Inference, On-Policy Distillation, Speculative Decoding), and restores a Previous News block with dated updates from December 2025.

Changes

Cohort / File(s)	Summary
Documentation Updates README.md	Added Release v0.5.0 news entry with Docker container and NeMo-Gym + NeMo-RL support; reinstated Previous News block with 12/1/2025 entries; reorganized Features section to include Muon Optimizer, SGLang Inference, On-Policy Distillation, and Speculative Decoding; updated Table of Contents and quick-start cross-references.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• docs: update roadmap post v0.4 #1607: Modifies README.md Features and News sections with overlapping updates to NeMo-Gym integration, LoRA/SFT/RL, and related feature entries.
• docs: Revise news section for nemotron v3 and DAPO algorithm support #1640: Updates README.md News and Previous News sections with similar release entry additions and reformatting of news items.
• docs: update latest news list #1390: Makes direct edits to README.md's News and Previous News section placement and content.

Suggested labels

documentation, CI:docs, r0.5.0

Suggested reviewers

• terrykong
• snowmanwwg

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Test Results For Major Changes	✅ Passed	This PR contains only minor documentation updates to README.md with no functional code changes that could affect numerics, convergence, or performance.
Title check	✅ Passed	The title 'docs: update readme post 0.5' accurately reflects the main change—updating documentation for the v0.5.0 release with new features, news, and organizational improvements.

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• Commit unit tests in branch euronymous-aithal-patch-1

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Actionable comments posted: 3

🤖 Fix all issues with AI agents

In `@README.md`:
- Around line 79-86: Update the README feature list to correct two user-facing
typos: change "suport" to "support" in the "SGLang Inference" bullet and change
"Speculaive Decoding" to "Speculative Decoding" in the corresponding bullet;
locate those exact strings ("SGLang Inference" and "Speculaive Decoding") in the
README content and replace the misspellings while preserving the existing
phrasing and punctuation.
- Line 85: The README line containing "🔜 **On-Policy Distillation** -
Multi-teacher and cross tokenizer distillation support" should hyphenate the
compound adjective: update the phrase to "Multi-teacher and cross-tokenizer
distillation support" (edit the README heading/text where that exact string
appears) so “cross-tokenizer” is grammatically correct.
- Around line 14-16: The nested list under the "0.5.0" news item has 4-space
indentation causing MD007 failures; update the nested bullet lines (eg. the
"NeMo-Gym + NeMo-RL support" and "📊 [Coming soon] release run" items) to use
2-space indentation so they align as a proper sub-list of the "Both
linux/amd64..." bullet.