Organize resumes by company in subdirectories

- Create subdirectories for each company (files/, valon/)
- Move company-specific resumes and cover letters to their directories
- Update Makefile to support FILE_NAME paths (e.g., files/resume-name)
- Improve clean target to recursively find .log files
- Update CLAUDE.md with new directory structure documentation
- Add examples for building PDFs from subdirectories
- Document cover letter placement and usage

This improves organization as more job-specific resumes accumulate.
Files can now be organized by company for easier management.

Makefile usage:
  make resume                                    # root directory (default)
  make resume FILE_NAME=files/paul-halvorsen-files-backend-engineer
  make resume FILE_NAME=valon/paul-halvorsen-valon-software-engineer

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Makefile

@@ -31,7 +31,7 @@ cleanpodman:
 	if [ ${CONTAINER_EXISTS} -ne 0 ]; then podman image rm -f ${NAME} && rm -f .podman-build; fi
 
 clean:
-	rm -f *.log
+	find . -name "*.log" -type f -delete
 
 cleanall: clean cleanpaper cleanpodman
 	@echo "Cleanup everything"