docs/ci: automate CHANGELOG updates and retroactively document post-v0.5.0 changes

- Fix semantic-release autoescape=true Jinja2 bug preventing CHANGELOG generation
- Add explicit changelog_file, mode=update, output_format=md to pyproject.toml
- Add fallback semantic-release changelog step in release.yml
- Manually true up CHANGELOG.md with comprehensive v0.40.0 retroactive entry covering
  all post-v0.5.0 additions: security middleware, 6 new storage providers, PDF processing
  improvements, dual-table status tracking, notification system, admin file manager,
  browser extension v1.1, path traversal fixes, and documentation additions
- Add Documentation-First Development section to CONTRIBUTING.md and AGENTIC_CODING.md
- Fix README.md quick-start commands and screenshots note
- Update TODO.md to reflect current version and completed tasks"

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

README.md

@@ -65,6 +65,8 @@ The project includes a **UI** for uploading and managing files, and an API docum
   <p><em>Files view with processed documents and metadata</em></p>
 </div>
 
+> **Note:** Screenshots may not reflect the very latest UI. For the most current look, visit [docuelevate.org](https://www.docuelevate.org).
+
 ## Workflow Process
 
 DocuElevate follows a streamlined document processing workflow:
@@ -140,11 +142,11 @@ For detailed installation and deployment instructions, please refer to the [Depl
 
 ```bash
 # Clone the repository
-git clone <repository_url>
-cd document-processor
+git clone https://github.com/christianlouis/DocuElevate.git
+cd DocuElevate
 
 # Configure environment variables
-cp .env.example .env
+cp .env.demo .env
 # Edit .env with your settings
 
 # Run with Docker Compose