Fondouk v1.2.1 — GET convenience bridge

Agentic browsers (e.g. Comet) query in GET, so this release adds a non-normative GET convenience alongside the canonical POST transport: GET /catalog/search?q=…&limit=…, /catalog/product?id=…, /catalog/lookup?ids=…, and the bare /fondouk/ucp?capability=…&query=… entry. Same schema-conformant payloads, same rate-limit and cache as POST. Advertised in the manifest (x-fondouk) and llms.txt. The manifest endpoint now records telemetry. Free & open-source (MIT). Verified on PrestaShop 8.2 and 9.1.