Remove obsolete README documentation references

[mxsm]

Summary

• Remove the historical diagnostics paragraph from Safety and portability because its local bench-results and docs targets were deleted during the v3.0.0 cleanup.
• Remove the now-empty Migration and architecture section, including seven dead migration/ADR links and the stale v3-alpha compatibility note.
• Preserve the valid CI, unsafe-constructor, and UTF-8 safety guidance.

Why

The referenced documentation no longer exists in the repository, leaving the README with misleading descriptions and broken local links.

Impact

Documentation only. No Rust code, API, build configuration, or runtime behavior changes.

Check

• git diff --check
• Confirmed the diff is limited to README.md and 23 obsolete lines.

Closes #137

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Review details

⚙️ Run configuration

Configuration used: defaults

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Run ID: d130c44f-d4bc-4a70-b831-998d3c80a0f3

📥 Commits

Reviewing files that changed from the base of the PR and between 84c8d84 and c96c03f.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch mxsm/remove-obsolete-readme-links

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[Copilot]

Pull request overview

Removes outdated sections from the README that referenced documentation paths deleted during the v3.0.0 cleanup, aiming to eliminate misleading text and dead local links while keeping current safety guidance intact.

Changes:

• Removed the historical diagnostics paragraph from “Safety and portability” that linked to removed local artifacts.
• Removed the now-empty “Migration and architecture” section, including stale migration/ADR links and v3-alpha compatibility wording.

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