⚡ [performance] Optimize Regexp Compilation in normalizeCommand

[eshanized]

💡 What: Extract regex compilations into package-level variables in internal/tools/exec/bash.go for the normalizeCommand function.
🎯 Why: To eliminate repetitive dynamic regex recompilations on every invocation of normalizeCommand, which was a major CPU overhead.
📊 Measured Improvement: We built a benchmark to evaluate the time cost. The time taken dropped from 7303 ns/op (baseline) to 3588 ns/op (optimized). This is an improvement of over 50%.

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PR created automatically by Jules for task 12628495636815695939 started by @eshanized

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Summary by cubic

Precompiles the regexes used by normalizeCommand in internal/tools/exec to avoid per-call compilation and cut CPU time. Previously we compiled two patterns on every call; now we reuse package-level regexp instances. Behavior is unchanged.

• Moves the comment-removal and whitespace-collapsing patterns to package-level vars (removeCommentsRegex, collapseSpaceRegex).
• Benchmark: 7303 ns/op → 3588 ns/op (~51% faster).
• Thread-safety: shared regexp instances are safe for concurrent reads.
• No migration required; outputs of normalizeCommand are unchanged.

^{Written for commit 7b344a5. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}