Fix task status: 'complete' -> 'completed' for taskgraph compatibility

tasks/setup/project-init.md

@@ -1,7 +1,7 @@
 ---
 id: setup/project-init
 name: Initialize Rust project with Cargo, dependencies, and module skeleton
-status: complete
+status: completed
 depends_on: []
 scope: moderate
 risk: low

tasks/setup/test-infrastructure.md

@@ -1,7 +1,7 @@
 ---
 id: setup/test-infrastructure
 name: Set up test infrastructure with integration test helpers and fixtures
-status: complete
+status: completed
 depends_on: [setup/project-init]
 scope: narrow
 risk: low