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* feat(mcp): PRO MCP server — WorldMonitor data via Model Context Protocol Adds api/mcp.ts: a Vercel edge function implementing MCP Streamable HTTP transport (protocol 2025-03-26) for PRO API key holders. PRO users point Claude Desktop (or any MCP client) at https://api.worldmonitor.app/mcp with their X-WorldMonitor-Key header and get 17 tools covering all major WorldMonitor data domains. - Auth: validateApiKey(forceKey:true) — returns JSON-RPC -32001 on failure - Rate limit: 60 calls/min per API key via Upstash sliding window (rl:mcp prefix) - Tools read from existing Redis bootstrap cache (no upstream API calls) - Each response includes cached_at (ISO timestamp) and stale (boolean) - tools/list served from in-memory registry (<500ms, no Redis) - Tool calls with warm cache respond in <800ms - 11 tests covering auth, rate limit, protocol, tools/list, tools/call * fix(mcp): handle Redis fetch throws + fix confusing label derivation P1: wrap executeTool call in tools/call handler with try-catch so TimeoutError/TypeError from AbortSignal.timeout in readJsonFromUpstash returns JSON-RPC -32603 instead of an unhandled rejection → 500. Mirrors the same guard already on the rate-limiter call above it. P2: walk backwards through cache key segments, skipping version tags (v\d+), bare numbers, 'stale', and 'sebuf' suffixes to find the first meaningful label. Fixes 'economic:fred:v1:FEDFUNDS:0' → 'FEDFUNDS' and 'risk:scores:sebuf:stale:v1' / 'theater_posture:sebuf:stale:v1' both resolving to 'stale' (which collides with the top-level stale flag). Adds test for P1 scenario (12 tests total, all pass).