feat: add comprehensive automated release system with GitHub Actions

[markhallen]

• Add GitHub Actions workflow for creating release PRs with smart version detection
• Add Rake tasks for local release management with automatic version bumping
• Add interactive release script with commit analysis and suggestions
• Add automatic changelog generation from conventional commits
• Add comprehensive documentation for release workflows
• Support multiple release workflows: GitHub Actions (web UI), Rake tasks (CLI), and interactive scripts
• Include intelligent commit analysis to suggest appropriate version bumps (major/minor/patch)
• Add dry-run mode for previewing releases before creation
• Support both manual and automatic version detection
• Add team-friendly PR-based release workflow with built-in reviews

This provides a complete release automation system supporting:

• 🚀 GitHub Actions: Web-based release creation with PR workflow
• 🧠 Smart Analysis: Automatic version bump suggestions from commit history
• 📝 Auto Changelog: Generate changelogs from conventional commit messages
• 🎯 Multi-Channel: Web UI, command line, and interactive script options
• 👥 Team Collaboration: PR-based reviews before release publishing
• 🛡️ Built-in Safety: Comprehensive testing and validation before releases

Description

Brief description of the changes in this PR.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring/code cleanup

Testing

• Tests pass locally
• New tests added for new functionality
• Manual testing completed

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Additional Notes

Add any additional notes or context about the PR here.

[Copilot]

Pull Request Overview

This PR introduces a comprehensive automated release system with GitHub Actions integration, providing multiple release workflows for the slack-github-threads project. The system includes smart commit analysis for automatic version bump suggestions, automatic changelog generation from conventional commits, and both web-based and CLI release options.

Key changes include:

• Add GitHub Actions workflow for creating release PRs with intelligent version detection
• Add comprehensive Rake tasks for local release management with automatic changelog generation
• Add interactive release script with guided workflow and commit analysis

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
.github/workflows/create-release-pr.yml	Main GitHub Actions workflow for automated release PR creation with smart analysis
.github/workflows/release.yml	Release publishing workflow triggered by tags or merged release PRs
Rakefile	Extensive release management tasks with version bumping and changelog generation
scripts/release.sh	Interactive shell script for guided release creation with commit analysis
docs/RELEASE_SYSTEM.md	Comprehensive documentation for all release workflows and features
docs/CONVENTIONAL_COMMITS.md	Guide for conventional commit formatting to support automatic changelog
.github/RELEASE.md	Configuration documentation for release workflows
.github/release.conf	Configuration file with release settings and patterns
README.md	Updated with release workflow documentation and usage examples
app.rb	Minor update to correct application name in logging output