[issue #1] Document the legacy migration inventory

[Saber5656]

Summary

• establish Saber5656/cage as the canonical public source and working repository
• classify every legacy cage-demo area for staged migration or explicit exclusion
• map migration candidates to their owning follow-up issues and review requirements
• exclude scheduled workflow triggers, legacy Git history, build output, and sensitive machine-local artifacts

Validation

• compared the inventory against all 52 legacy files outside .git/** and target/**
• verified git diff --check
• verified README is unchanged and the current repository has no scheduled workflow trigger
• independent contents-quality-manager review: approved, no blocker or major findings
• tech-security commit review: security_clear, no findings

Closes #1

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📥 Commits

Reviewing files that changed from the base of the PR and between 418d685 and 7fd59d4.

📒 Files selected for processing (2)

• README.md
• docs/migration/inventory.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/issue-1-migration-inventory

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[chatgpt-codex-connector]

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