Demo: Complete GitHub workflow for setup_workflow_demo.sh

[gdellis]

Summary

Demonstrates the complete GitHub Pull Request workflow with a new installer script.

Changes Made

Added:

• installers/setup_workflow_demo.sh - New installer demonstrating workflow

Features:

• ✓ Proper metadata (Description, Category, Usage)
• ✓ Bash strict mode (set -euo pipefail)
• ✓ ShellCheck compliance (no errors)
• ✓ Library references (logging.sh, dependencies.sh)
• ✓ Consistent structure with other installers
• ✓ Help option and non-interactive mode

Pre-PR Requirements (All Met)

• Installer passes validation ✓ (16/16 total now pass)
• ShellCheck passes locally ✓ (severity=error)
• Commit message follows conventional format ✓
• Branch is up-to-date with main ✓

Testing Performed

# Validation
./validate_installers.sh
Total installers: 17
Passed: 17 ✓
Failed: 0

# ShellCheck
shellcheck --severity=error --external-sources installers/setup_workflow_demo.sh
# (no output = all good)

Workflow Demonstration

This PR demonstrates the complete GitHub workflow documented in AGENTS.md:

1. ✓ Create feature branch: feature/demo-workflow
2. ✓ Validate and test changes
3. ✓ Commit and push changes
4. ✓ Create pull request
5. → Wait for automated checks (ShellCheck)
6. → Code review and merge

Files Changed

• installers/setup_workflow_demo.sh (63 lines)

This PR serves as both a functional addition and documentation of the workflow process.