docs: describe fgumi as a research preview instead of alpha

[nh13]

Summary

• Rebrand README warning from "ALPHA SOFTWARE" to "RESEARCH PREVIEW"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.29%. Comparing base (0757238) to head (b002ee4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #248      +/-   ##
==========================================
- Coverage   89.29%   89.29%   -0.01%     
==========================================
  Files         118      118              
  Lines       57201    57201              
==========================================
- Hits        51080    51079       -1     
- Misses       6121     6122       +1     

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[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 38f4a08b-79e5-426b-9386-ef6c8c2d126e

📥 Commits

Reviewing files that changed from the base of the PR and between 85e210e and b002ee4.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README's maturity status banner has been updated from "ALPHA SOFTWARE" to "RESEARCH PREVIEW" with corresponding changes to the disclaimer text from "currently in ALPHA" to "currently a research preview." The disclaimer retains the existing language about no guarantees regarding correctness or stability. The changes involved minor sentence restructuring across multiple lines.

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	Title describes only the README rebranding change, but commit history shows major performance/correctness overhaul to sort worker-pool, which is the substantial actual work.	Update title to reflect the primary change: performance/correctness improvements to Phase 2 sort worker-pool design, or split into separate PRs.
Description check	⚠️ Warning	Description only mentions the README rebranding but omits the major sort worker-pool redesign detailed in commit history, creating a significant mismatch.	Update description to include the sort worker-pool overhaul, Phase2FileState redesign, deadlock/race fixes, and Rayon threading improvements.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch nh/readme-research-preview

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