[SaladDay]

Replace the one-line agent review rule with an independent review gate in AGENTS.md, matching the gate used across the maintainer's other repositories and adapted to OpenAgentCore.

• One fresh blind reviewer by default; two when a change touches a protocol's code or document, database schema or migrations, authentication, credentials or isolation, or a shared lifecycle, admission, cancellation or reuse flow.
• Follow-up rounds review only the changes since the last reviewed range, with one new reviewer.
• At most three rounds; the gate ends either by finishing with medium/low findings listed, or by reassessing the design, with one corrected design allowed through the gate before stopping to report.
• In-scope blocker, high-severity and data-integrity findings always block completion; problems outside the task boundaries are recorded and reported.
• Documentation changes are reviewed too, because docs/ and contracts/ include protocol and contract sources.

CONTRIBUTING.md keeps its review paragraph for contributors, points agents to the gate, and lists the gate in the ownership table.

Reviewed in three blind rounds; all validated findings were fixed except the "blind review workflow" link label in contracts/agents-api/harness-onboarding.md (and its Chinese mirror), which is outside this change.

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