chore(docs): drop refs to deleted graze-cli and gary repos

[OpenGaryBot]

Open-Paws/graze-cli and Open-Paws/gary are being deleted.

• README.md tier table: drop graze-cli (Tier 1 example) and gary (Tier 3 example)
• AGENTS.md integration list: drop graze-cli + gary lines

Closes #15

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: c12f18c1-5cd8-47da-881f-85eff7bcc19c

📥 Commits

Reviewing files that changed from the base of the PR and between dba4e57 and 2f9bcff.

📒 Files selected for processing (2)

• AGENTS.md
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/drop-deleted-repo-refs

• 🛠️ fix NAV violations: Commit on current branch
• 🛠️ fix NAV violations: Create PR

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