Update Codex guidance for Tree Ring v0.13

[TerminallyLazy]

What changed

• bump the Codex plugin wrapper from 0.1.0 to 0.2.0
• require Tree Ring Memory CLI 0.13.0 or newer
• add canonical same-host worker identity, operation-id retry, fan-in, and source-reference guidance
• document Coordinated mode, one-time coordinator capability handling, and protected write/maintenance restrictions
• add the schema-v3 upgrade and mixed-version fence
• run a checked-in contract validator before the existing HOL plugin scan

Why

Tree Ring Memory v0.13.0 adds coordinated-write authorization and schema v3. The Codex wrapper must not send v0.12 writers into an upgraded shared root or omit the identity and authorization rules that keep same-host fan-out/fan-in deterministic.

Validation

• sh -n scripts/validate-plugin.sh
• sh scripts/validate-plugin.sh
• python3 -m json.tool .codex-plugin/plugin.json
• Ruby YAML parse of .github/workflows/hol-plugin-scanner.yml
• git diff --check

The shared-root claim remains bounded to concurrent processes on one host using a local filesystem.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 53841f88-0e2e-4278-894d-15406d6d7568

📥 Commits

Reviewing files that changed from the base of the PR and between 6b2842d and a0be732.

📒 Files selected for processing (5)

• .codex-plugin/plugin.json
• .github/workflows/hol-plugin-scanner.yml
• README.md
• scripts/validate-plugin.sh
• skills/tree-ring-memory/SKILL.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/v0.13-multi-agent-guidance

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