Add Utilia Solana preflight agent

[mohamedkuch]

What changed

• adds a schema-valid utilia-solana-preflight agent definition
• describes all six live read-only Solana preflight and media tools with exact prices
• includes fail-closed payment constraints for Solana mainnet USDC, the receiver, and the per-call ceiling
• links the live MCP, OpenAPI, agent guide, npm buyer client, and on-chain identity
• includes the definition in the package overlay used when the private full catalog source is present

Why

Agents that trade or manage Solana transactions need an independent preflight layer before a wallet signs or broadcasts. Utilia provides live priority-fee estimates, unsigned transaction simulation, failure diagnostics, token authority and concentration checks, PDF-to-Markdown, and audio normalization without custody or execution.

Validation

• ajv validate --spec=draft7 -c ajv-formats -s schema/clawdAgentSchema.v1.json -d agents/utilia-solana-preflight.json
• node --check build-catalog.cjs
• verified production health, MCP discovery, HTTP 402 challenges, the agent guide, and the on-chain identity

The committed catalog cannot currently be reproduced from a clean public checkout because the build selects a gitignored src/ catalog when present in the maintainer environment. This PR therefore includes the source definition and package-overlay entry but does not commit a locally regenerated catalog that would remove private-source entries.

[mohamedkuch]

The Utilia agent entry now has independent paid-path validation. OOBE merged its SDK integration after a real $0.002 USDC call settled successfully: OOBE-PROTOCOL/synapse-client-sdk#50 (comment). This PR remains mergeable. Could you review it and confirm whether the repository expects any additional agent metadata before merge?