⚡ Bolt: [performance improvement] Eliminate unnecessary heap allocations in redact_string

[EffortlessSteven]

💡 What: Updated redact_string to use Cow when performing regex replacements.
🎯 Why: The previous code was calling .to_string() on the results, which unconditionally allocated a new String object via the Display trait regardless of whether a regex match was actually found. By using Cow::Borrowed and checking for Cow::Owned to indicate a replacement happened, we avoid allocating when there are no secret matches.
📊 Impact: Eliminates unneeded heap allocations when running redact_string, reducing garbage and making the function strictly zero-allocation for non-matching secrets (the common case).
🔬 Measurement: Run unit tests / benchmarks in crates/xchecker-redaction. Tested via cargo test -p xchecker-redaction.

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PR created automatically by Jules for task 12867709291929586689 started by @EffortlessSteven

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 80ca5299-8379-4ba6-9d9c-f047683abee1

📥 Commits

Reviewing files that changed from the base of the PR and between 4138f8e and 7d34574.

📒 Files selected for processing (3)

• .jules/bolt.md
• crates/xchecker-redaction/src/lib.rs
• tests/test_unix_process_termination.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bolt-redact-cow-allocations-12867709291929586689

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