build: tag shared workflows with semver for Renovate tracking

[jimisola]

Summary

The shared reusable workflows in this repo (e.g., check-semantic-pr.yml) are currently referenced via @main across all 12+ reqstool repos. This prevents Renovate/Dependabot from tracking version updates and makes it hard to pin for supply-chain security.

Proposal

1. Tag this repo with semver (e.g., v1.0.0)
2. Update all repos to reference @v1 instead of @main
3. This enables Renovate to track and auto-update the shared workflow reference

Affected repos

All repos that reference reqstool/.github/.github/workflows/check-semantic-pr.yml@main:

• reqstool-client
• reqstool-python-decorators
• reqstool-python-hatch-plugin
• reqstool-python-poetry-plugin
• reqstool-java-annotations
• reqstool-java-maven-plugin
• reqstool-java-gradle-plugin
• reqstool-typescript-tags
• reqstool-vscode-extension
• reqstool-demo
• reqstool-ai
• reqstool-test-packages

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