Add set -e and --ff-only to release Makefile targets

[jabawack81]

Summary

Follow-up from CodeRabbit review on #2 (pushed after merge).

• Add set -e to release recipe so git failures abort immediately
• Use git pull --ff-only origin main in tag target to prevent accidental merge commits

Test plan

• make help shows correct targets
• make tag VERSION= without a version prints usage and exits

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 240147ce-f12f-4f0b-aede-4aaadfd5f634

📥 Commits

Reviewing files that changed from the base of the PR and between fc6c6bc and 2c75b47.

📒 Files selected for processing (1)

• Makefile

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/release-makefile-safety

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