feat: add TaskMarket MCP server integration and delegate skill

[prayItCompiles]

Add TaskMarket marketplace tools to the Aeon MCP server, exposing 10 taskmarket_* tools for browsing, creating, and submitting work on the Base onchain agent marketplace.

Changes

• apps/mcp-server/src/taskmarket-tools.ts: MCP tool definitions and CLI wrappers with side-effect gate
• apps/mcp-server/src/taskmarket-tools.test.ts: 12 vitest tests
• apps/mcp-server/src/index.ts: Route taskmarket_* tools through MCP server
• skills/taskmarket-delegate/: Aeon skill for delegating work to TaskMarket
• aeon.yml: Register taskmarket-delegate as on-demand skill
• catalog/skills.json: Regenerate to include new skill + tools

All 12 tests pass. TypeScript compiles cleanly.

[aaronjmars]

Closing in favor of #865, which lands the same taskmarket-delegate skill via a self-contained zero-dependency client that works in the Aeon runner. This PR's MCP-server approach shells out to a third-party @lucid-agents/taskmarket CLI that is never staged in the runner (so every tool errors at runtime), declares the skill mode: read-only while it performs on-chain spends (create/submit) and writes under memory/, is missing its eyebrowlock.json entry (fails ci-skill-integrity), and has no operator-authorization gate on taskmarket_create_task (which funds escrow). If we want the MCP-client tool surface later, we can revisit with the CLI staged, an eyebrowlock entry, the mode corrected, and a spend-authorization gate. Thanks for the contribution.