decompose architecture into 38 atomic tasks across 12 parallel generations

Decompose the reviewed architecture specs into taskgraph-managed tasks:
- 2 setup tasks (project init, test infrastructure)
- 4 schema tasks (enums, node attrs, edge attrs, graph schemas)
- 1 error hierarchy task
- 6 graph tasks (FlowGraph class, 3 construction paths, queries, validation)
- 5 analysis tasks (type-compat, build-type-edges, ordering, template-validation, defaults)
- 5 component tasks (Operation, Sequential, Parallel, Conditional, Map)
- 2 host config tasks (GraphologyHostConfig, ReactiveHostConfig)
- 4 reactive tasks (WorkflowRoot, node-status, max-concurrency, retry-semantics)
- 3 review tasks (foundation, reactive-and-hosts, complete-library)
- 5 meta cluster tasks (schema, graph, component, reactive, analysis layers)
- 1 API exports task

Validated with taskgraph: zero cycles, 38 tasks, 12 parallel generations.
Critical path: 12 tasks through reactive execution layer.

tasks/meta-schema-layer.md

@@ -0,0 +1,37 @@
+---
+id: meta/schema-layer
+name: Complete schema layer — all enums, node/edge attributes, graph schemas, and CallResult
+status: pending
+depends_on:
+  - schema/enums
+  - schema/node-attrs
+  - schema/edge-attrs
+  - schema/graph-schemas
+scope: broad
+risk: low
+impact: component
+level: planning
+---
+
+## Description
+
+Meta task that clusters all schema tasks. Once all schema tasks are complete, the entire type-safe foundation of the library is in place. Schema tasks can be executed in sequence (each depends on the prior) or with some parallelism (node-attrs depends on enums, edge-attrs depends on both, graph-schemas depends on all).
+
+## Acceptance Criteria
+
+- [ ] All schema tasks completed
+- [ ] `@alkdev/flowgraph/schema` sub-path exports all schemas, types, and enums correctly
+- [ ] `Value.Check()` validates against all schemas
+- [ ] TypeScript types are correctly derived via `Static<typeof>`
+
+## References
+
+- docs/architecture/schema.md
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion