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/review-foundation.md

@@ -0,0 +1,51 @@
+---
+id: review/foundation
+name: Review foundation layer — schemas, errors, FlowGraph class, construction
+status: pending
+depends_on:
+  - schema/enums
+  - schema/node-attrs
+  - schema/edge-attrs
+  - schema/graph-schemas
+  - error/hierarchy
+  - graph/flowgraph-class
+  - graph/construction-operation
+  - graph/construction-call
+  - graph/construction-json
+  - graph/queries
+  - graph/validation
+scope: broad
+risk: low
+impact: phase
+level: review
+---
+
+## Description
+
+Review the foundation layer before proceeding to analysis components, host configs, and reactive execution. Verify schemas match architecture docs, errors are correctly structured, and FlowGraph construction preserves DAG invariants.
+
+## Acceptance Criteria
+
+- [ ] All TypeBox schemas match [schema.md](../docs/architecture/schema.md) — no missing fields, no extra fields
+- [ ] Error hierarchy matches [error-handling.md](../docs/architecture/error-handling.md) — all classes have correct properties
+- [ ] FlowGraph class wraps graphology correctly per [flowgraph-api.md](../docs/architecture/flowgraph-api.md)
+- [ ] Operation graph construction: fromSpecs builds correct nodes and edges
+- [ ] Call graph construction: fromCallEvents and updateFromEvent process all event types correctly
+- [ ] JSON round-trip is lossless for both operation and call graphs
+- [ ] All query methods delegate correctly to graphology-dag
+- [ ] Validation functions return structured errors, never throw
+- [ ] All tests pass: `npm test`
+- [ ] TypeScript strict mode compilation succeeds: `npx tsc --noEmit`
+
+## References
+
+- docs/architecture/schema.md, docs/architecture/error-handling.md, docs/architecture/flowgraph-api.md
+- docs/architecture/operation-graph.md, docs/architecture/call-graph.md
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion