Enable overflow-checks in release profile

[SashaMIT]

Summary

• Sets overflow-checks = true under workspace [profile.release] so release builds catch integer overflow instead of wrapping by default.
• Secure-default / hardening only — no program logic changes.

Context

Amber-authorized hardening note. Already coordinated via hello@drift.trade; opening this small PR so the release profile matches common Solana program secure defaults.

Test plan

• Confirm tip Cargo.toml [profile.release] includes overflow-checks = true
• cargo check / usual release build still succeeds for workspace members

Made with Cursor

Summary by CodeRabbit

• Bug Fixes
  • Added overflow checks to release builds to help detect arithmetic errors and improve runtime reliability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 21110225-3555-431e-8bba-eb2ad9858a89

📥 Commits

Reviewing files that changed from the base of the PR and between 13e8e9b and 74c5f80.

📒 Files selected for processing (1)

• Cargo.toml

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Walkthrough

The change updates Cargo.toml to enable runtime integer overflow checks in the release profile.

Changes

Release overflow checks

Layer / File(s)	Summary
Release profile overflow check setting Cargo.toml	The release profile now enables runtime integer overflow checks.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

Little rabbit checked the sum,
In release mode, safe checks now run.
No overflow hops past the gate,
The build stays strict, the math stays straight.
🐇✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the main change: enabling overflow checks in the release profile.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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