test: duplicate subject detection - PASS case

[matmar10]

Purpose

Tests the duplicate_threshold feature with commits whose subjects are clearly distinct.

What this tests

• duplicate_threshold: '0.8' is enabled in the CI workflow
• All 4 commits have normalized subjects with dice similarity well below 0.8

Commit	Subject (normalized)
feat: add user authentication module	add user authentication module
fix: resolve session timeout on idle users	resolve session timeout on idle users
docs: update contributing guidelines	update contributing guidelines

Expected result

✅ Action passes — no duplicate pairs detected

[github-actions]

✅🙏🏻 Conventional Commit 🥳 🎉

🤖 Beep boop! Congrats, it like all your commit messages conform to the Conventional Commit spec! 👏👏👏

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Commit Message Lint Report

• ✏️ 4 commit(s)
• 👤 1 author(s)
• ❌ 0 lint error(s)
• ⚠️ 0 lint warning(s)