Docs: remove speculative compatibility guidance

[nerdchanii]

Summary

• remove the future-release row from the public compatibility table
• keep the page focused on released package pairings only
• preserve the existing boundary note about unpublished main-branch behavior

Context

• follow-up to the post-merge Codex review comment on Docs: rewrite compatibility and migration for users #124

Verification

• npm run docs:build
• npm run lint

[nerdchanii]

@codex review

Context:

• Follow-up to the missed post-merge review comment from Docs: rewrite compatibility and migration for users #124
• Scope: only remove speculative future-release guidance from the public compatibility table

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

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