fix: increase line proximity for finding grouping and dedup (#234)

[justn-hyeok]

Summary

• Increased LINE_PROXIMITY from 5 to 15 in threshold.ts so that findings on the same function but 10+ lines apart are grouped into a single discussion instead of creating duplicates.
• Relaxed the strict overlap check in deduplication.ts to also consider proximity (within 15 lines), matching the threshold grouping logic.
• Updated test expectation for non-overlapping ranges to use a wider gap (30+ lines) to reflect the new proximity value.

Closes #234

Test plan

• pnpm --filter @codeagora/core test — all 219 tests pass
• Manual verification: run pipeline on a diff with nearby findings (10-15 lines apart) and confirm they merge into a single discussion

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 978b4e36-40d1-451b-8d7b-004a64b752e8

📥 Commits

Reviewing files that changed from the base of the PR and between 80863a5 and 5b9eeae.

📒 Files selected for processing (3)

• packages/core/src/l2/deduplication.ts
• packages/core/src/l2/threshold.ts
• packages/core/src/tests/l2-dedup.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/increase-line-proximity-dedup-234

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