Complete memory graph and document value workplans

examples/memory/invalid-memory-graph.yaml

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+schema_version: markitect.memory.graph.v1
+id: invalid-memory-graph
+title: Invalid Memory Graph
+intent: Exercise graph validation diagnostics for fixture consumers.
+nodes:
+  - id: node.unknown-kind
+    kind: unknown_kind
+    text: This node kind is not part of the memory graph vocabulary.
+edges:
+  - id: edge.unknown-target
+    kind: supports
+    source: node.unknown-kind
+    target: node.missing
+events:
+  - id: event.unknown-kind
+    kind: unrecognized_event
+    timestamp: "2026-05-15T08:35:00Z"