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/api-public-exports.md

@@ -0,0 +1,49 @@
+---
+id: api/public-exports
+name: Wire barrel exports and verify exports map resolves correctly for all sub-paths
+status: pending
+depends_on:
+  - review/reactive-and-hosts
+  - analysis/type-compat
+  - analysis/build-type-edges
+  - analysis/ordering
+  - analysis/template-validation
+  - analysis/defaults
+scope: moderate
+risk: low
+impact: phase
+level: implementation
+---
+
+## Description
+
+Wire all barrel exports (`src/index.ts` and module `index.ts` files) and verify the package.json exports map resolves correctly for every sub-path. This is the integration check that all modules are properly connected and importable.
+
+## Acceptance Criteria
+
+- [ ] `src/index.ts` re-exports from all modules: graph, schema, component, host, reactive, analysis, error
+- [ ] Each module's `index.ts` exports the correct public API per [flowgraph-api.md](../docs/architecture/flowgraph-api.md) exports map table
+- [ ] Sub-path `@alkdev/flowgraph` → all public types
+- [ ] Sub-path `@alkdev/flowgraph/graph` → FlowGraph, FlowGraphOptions
+- [ ] Sub-path `@alkdev/flowgraph/schema` → all schemas, enums, types, CallResult
+- [ ] Sub-path `@alkdev/flowgraph/component` → Operation, Sequential, Parallel, Conditional, Map
+- [ ] Sub-path `@alkdev/flowgraph/host` → GraphologyHostConfig, ReactiveHostConfig
+- [ ] Sub-path `@alkdev/flowgraph/reactive` → WorkflowReactiveRoot, WorkflowNode, ReactiveContext, EventLogProjection
+- [ ] Sub-path `@alkdev/flowgraph/analysis` → typeCompat, buildTypeEdges, validateGraph, validateTemplate, topologicalOrder, parallelGroups, criticalPath, reachableFrom
+- [ ] Sub-path `@alkdev/flowgraph/error` → all error classes
+- [ ] `npm run build` produces correct ESM + CJS + declarations for all entry points
+- [ ] Import resolution test: each sub-path is importable after build
+- [ ] TypeScript compilation succeeds: `npx tsc --noEmit`
+
+## References
+
+- docs/architecture/flowgraph-api.md — complete exports map
+- docs/architecture/build-distribution.md — exports map, tsup configuration
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion