Document autonomous memory curation workflow

[ScriptedAlchemy]

Summary

• Add an autonomous memory curation operator guide with review and deletion guardrails
• Clarify read-only subagent usage across TraceDecay Codex skills
• Note that registered-project selectors belong in TraceDecay surfaces, not only host-specific skills

Verification

• git diff --check

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Latest commit: 5b57b67

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[chatgpt-codex-connector]

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