feat: graceful shutdown — SIGINT handler

[ajianaz]

Summary

• Add ctrlc = "3" dependency to uteke-cli
• Add Uteke::shutdown() method — saves dirty vector index to disk
• Install SIGINT handler in main.rs via AtomicBool
• Call shutdown() after every command execution
• Exit with code 130 on SIGINT

Changes

• crates/uteke-cli/Cargo.toml — add ctrlc dep
• crates/uteke-core/src/lib.rs — add shutdown() method
• crates/uteke-cli/src/main.rs — ctrlc handler + shutdown call

Verification

• cargo check ✓
• cargo clippy ✓
• cargo test — 15/15 passed ✓
• cargo fmt ✓

Closes #31

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 71c9a1c0-88b5-40e6-ad2d-d494d53d7345

📥 Commits

Reviewing files that changed from the base of the PR and between b92a7b1 and 2c55748.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (3)

• crates/uteke-cli/Cargo.toml
• crates/uteke-cli/src/main.rs
• crates/uteke-core/src/lib.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/graceful-shutdown

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