feat: migrate agentmemory to agentcache namespace, endpoints, and tools

feat: dedup observations, fix dashboard buttons, add per-obs delete

fix: Hugging Face sync, routing, dashboard, and agent isolation bugs

fix: compat shim for legacy observe callers - map sessionId/cwd to folderPath/agentId

feat: upscale & UX overhaul — blueprint split, debounce, tests, viewer enhancements, DX improvements