docs(design): add org-roam knowledge-base spec for shared agent memory

The spec adopts the existing ~/sync/org/roam/ KB (Syncthing-synced, 484 files) as the shared store agents read from and write to, so cross-machine memory sync comes for free instead of needing new infrastructure. It recommends the mechanics (queried as files, capture in harness memory then promote durable facts to the KB, a claude-rules pointer, an :agent: write schema) and leaves the work/personal write boundary for ratification. Supersedes the dedicated-repo and two-tier approaches for the storage-and-sync half.

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