docs: add News section with XL (4B DiT) release announcement

[ChuxiJ]

Summary

• Add 📰 News section to README.md (first entry: XL release)
• Links to all 3 XL HuggingFace repos (xl-base, xl-sft, xl-turbo)
• Add News to Table of Contents

Context

All XL models have been uploaded to HuggingFace:

• https://huggingface.co/ACE-Step/acestep-v15-xl-base
• https://huggingface.co/ACE-Step/acestep-v15-xl-sft
• https://huggingface.co/ACE-Step/acestep-v15-xl-turbo

Test plan

• Markdown renders correctly
• All HF links are valid

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Added a new News section to the documentation to showcase the latest model releases and announcements
  • Introduced the ACE-Step 1.5 XL (4B DiT) variant with links to three new XL model variants for download and use
  • Provided comprehensive VRAM requirements and system compatibility information to help users select the appropriate models for their setup

[coderabbitai]

📝 Walkthrough

Walkthrough

README.md updated with a new "📰 News" section announcing the ACE-Step 1.5 XL (4B DiT) release dated 2026-04-02, including links to three Hugging Face model variants (xl-base, xl-sft, xl-turbo), VRAM requirements, and compatibility notes. Table of Contents also updated to reference the new section.

Changes

Cohort / File(s)	Summary
Documentation Update README.md	Added new "📰 News" section with release announcement for ACE-Step 1.5 XL models, including Hugging Face links and specifications. Updated Table of Contents to include News section reference.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 Hop, hop, hooray! New models appear,
Five shiny lines bring the news crystal clear,
XL variants dance on Hugging Face's stage,
A footnote of magic turns over the page! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a News section to the README with an XL release announcement, which aligns with the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ 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 release/v0.1.6-xl-announcement

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[coderabbitai]

🧹 Nitpick comments (1)

README.md (1)

19-19: Consider reducing duplicated spec text to avoid doc drift.

This news entry repeats VRAM/compatibility details that are already maintained in Quick Start / Model Zoo. Prefer a shorter announcement plus links to canonical sections to keep future updates consistent.

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@README.md` at line 19, The release entry "🎉 ACE-Step 1.5 XL (4B DiT)
Released!" in README.md duplicates VRAM and compatibility specs already
documented in Quick Start / Model Zoo; shorten the announcement to a one-line
summary and remove the VRAM/compatibility sentences, replacing them with links
to the canonical sections (e.g., "See Quick Start / Model Zoo for system
requirements and compatibility") so future updates live in one place and avoid
doc drift.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@README.md`:
- Line 19: The release entry "🎉 ACE-Step 1.5 XL (4B DiT) Released!" in
README.md duplicates VRAM and compatibility specs already documented in Quick
Start / Model Zoo; shorten the announcement to a one-line summary and remove the
VRAM/compatibility sentences, replacing them with links to the canonical
sections (e.g., "See Quick Start / Model Zoo for system requirements and
compatibility") so future updates live in one place and avoid doc drift.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1f5c07af-c3bd-485b-8e8d-2a735cf58d92

📥 Commits

Reviewing files that changed from the base of the PR and between df7e50c and 19753cc.

📒 Files selected for processing (1)

• README.md