chore: update task status to completed for component-sequential, error-hierarchy, schema-enums

tasks/component-sequential.md

@@ -1,7 +1,7 @@
 ---
 id: component/sequential
 name: Implement <Sequential> ujsx component
-status: pending
+status: completed
 depends_on:
   - setup/project-init
 scope: single

tasks/error-hierarchy.md

@@ -1,7 +1,7 @@
 ---
 id: error/hierarchy
 name: Implement FlowgraphError hierarchy with all error classes and validation result types
-status: pending
+status: completed
 depends_on:
   - setup/project-init
 scope: narrow

tasks/schema-enums.md

@@ -1,7 +1,7 @@
 ---
 id: schema/enums
 name: Define TypeBox categorical enum schemas and type aliases
-status: pending
+status: completed
 depends_on:
   - setup/project-init
 scope: narrow