feat: extract version bump logic into reusable script

.github/scripts/README.md

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+# GitHub Scripts
+
+This directory contains reusable scripts for GitHub Actions workflows.
+
+## version-bump.sh
+
+Extracts version bump logic from GitHub Actions workflows into a reusable script.
+
+### Usage
+
+```bash
+./version-bump.sh <bump_type> [base_ref]
+```
+
+**Parameters:**
+- `bump_type`: Type of version bump (`patch`, `minor`, or `major`)
+- `base_ref`: Base reference for diff comparison (default: `origin/main`)
+
+### Examples
+
+```bash
+# Bump patch version for modules changed since origin/main
+./version-bump.sh patch
+
+# Bump minor version for modules changed since a specific commit
+./version-bump.sh minor abc123
+
+# Bump major version for modules changed since a specific branch
+./version-bump.sh major origin/develop
+```
+
+### What it does
+
+1. **Detects modified modules** from git diff changes
+2. **Gets current version** from latest release tag or README
+3. **Calculates new version** based on bump type
+4. **Updates README versions** in module documentation
+5. **Provides summary** of changes and next steps
+
+### Version Detection
+
+- **Tagged modules**: Uses latest `release/namespace/module/vX.Y.Z` tag
+- **Untagged modules**: Extracts version from README `version = "X.Y.Z"` 
+- **New modules**: Start from v1.0.0
+
+### Exit Codes
+
+- `0`: Success (with or without changes)
+- `1`: Error (invalid arguments, no modules found, invalid version format, etc.)
+
+### Integration with GitHub Actions
+
+This script is designed to be called from GitHub Actions workflows. See `.github/workflows/version-bump.yaml` for an example implementation that:
+
+- Triggers on PR labels (`version:patch`, `version:minor`, `version:major`)
+- Runs the script with appropriate parameters
+- Commits any README changes
+- Comments on the PR with results
+
+### Notes
+
+- Only updates READMEs that contain version references matching the module source
+- Warns about modules missing proper git tags
+- Follows semantic versioning (X.Y.Z format)
+- Validates all version components are numeric