docs(FN-2094): align memory plugin contract with OpenClaw layout
- Rewrite memory backend contract docs to match shipped MemoryBackend interfaces, capabilities, and registry behavior - Clarify .fusion/memory/ as the canonical layered workspace and keep .fusion/memory.md compatibility-only - Document backend resolution through memoryBackendType with qmd as the default and qmd-to-file search fallback behavior - Synchronize architecture, contributing, and settings reference docs with the updated memory model terminology
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