Update documentation/architecture/openspec/project.md with project details and conventions

- Filled in Purpose, Tech Stack, Project Conventions, Domain Context, and External Dependencies sections.
- Referenced `documentation/architecture/filesystem.rst` in Project Conventions.
- Referenced architectural decision records for Three-Tier Architecture and Centralized Import Pattern.
- Referenced test plan summary in Testing Strategy.
- Replaced specific project name with "The project" for maintainability.

Author: google-labs-jules[bot]

documentation/architecture/openspec/project.md

@@ -2,7 +2,7 @@
 
 ## Purpose
 
-The **emcd-projects** project addresses the complete lifecycle of Python projects, from creation to maintenance. It provides:
+The project addresses the complete lifecycle of Python projects, from creation to maintenance. It provides:
 
 1.  **Project Template**: A Copier-based template for rapid scaffolding of new Python projects with consistent structure and configuration.
 2.  **Runtime Management**: A Python package (`emcdproj`) for ongoing project maintenance, including static site generation and badge management.