chore(repo): initialize project's repository structure

- Adds src/tests/docs scaffolding
- Preserves Stage 1 planning tasks
- Adds local orchestration folders (.repo-context, .repo-tasks)
- Applies GitFlow development base branch

.gitignore

@@ -0,0 +1,4 @@
+.repo-tasks/
+.repo-context/
+.tasks/
+.agile/