chore: delete PLAN.md

[maehr]

Replaces #56. A merge loop merged #56 into feat/map-explanations instead of main. The content is unchanged.

Summary

• Delete PLAN.md. feat: add a book demo that shows the ordered-text mode #44 and feat: replace the Run sidebar with the About section #45 are merged.

Refs #46.

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https://claude.ai/code/session_01EsEUVKgZPLky1kHXnU2aBW

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• Configuration used: defaults
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• Run ID: 41101e41-535c-40f8-bcf9-6b00f23c50cf

📥 Commits

Reviewing files that changed from the base of the PR and between 1fc64bc and df85eb8.

📒 Files selected for processing (1)

• PLAN.md

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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[Copilot]

Copilot review overview

🟢 Approval recommended

The documentation-only deletion matches the planned cleanup and has no identified blocking issues.

Review effort: Balanced
Findings: None

What changed in this PR

Removes the completed implementation plan as part of the release housekeeping tracked in #46.

Changes:

• Delete PLAN.md now that #44 and #45 are merged; no runtime code changes.

File	Description
PLAN.md	Removes the obsolete book-demo and About-sidebar plan.

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