v0.2.3 — keyless metadata discovery

Data MCP 0.2.3 allows initialization, tool and resource listings, and the reviewed therundown://brief read without a Product API key. Product API tool calls remain authenticated. All six tools now publish human-readable titles and structured output schemas. The attached source ZIP is 41,072 bytes with SHA-256 cb0a0841aa040f049ffddec5b5fa2436cb9de721a30a3bd53270132db7204025.