[zening-cmd]

Closes #229

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The agent contract page drifted from packages/agent-harness/src/canonical.ts. This brings it back in line:

• Capabilities table: childSessions is replaced by the two flags the code split it into, nativeChildProjection and gatewayChildSessions, each with a one-line explanation below the table. The table now lists exactly the 21 fields of NegotiatedCapabilities (checked programmatically: none missing, none extra).
• Event vocabulary: adds delegation.control (wait, send, resume, close, gather) to the child-session row, matching CanonicalDelegationControlKind.
• Context markers: adds approval, matching ContextMarkerKind.

Proof: each line maps to a definition in canonical.ts (ContextMarkerKind at ~L205, delegation.control at ~L303, NegotiatedCapabilities at ~L388). Docs-only change.

Prepared with Sai, an AI coworker by Simular; submitted by @zening-cmd.

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