⚡ Bolt: Hoist os.Executable() in cron generation for 8x speedup

[minibota]

⚡ Bolt: Optimized generateCronContent by hoisting os.Executable() out of the loop.

💡 What: Moved the os.Executable() call, which determines the path of the running binary, outside of the loop that iterates over cron jobs.
🎯 Why: os.Executable() performs a system call (readlink on Linux) that is not cached. calling it for every job in a loop (O(N)) creates unnecessary overhead.
📊 Impact:

• Speed: ~8x faster (285958 ns/op -> 33609 ns/op)
• Memory: ~98% fewer allocations (302 -> 5 allocs/op)
• Syscalls: Reduced from O(N) to O(1) per generation.

🔬 Measurement:
Verified with a benchmark (removed before submission to keep codebase clean).
Baseline:

BenchmarkGenerateCronContent-4   	    3992	    285958 ns/op	   49922 B/op	     302 allocs/op

Optimized:

BenchmarkGenerateCronContent-4   	   36823	     33609 ns/op	   30912 B/op	       5 allocs/op

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PR created automatically by Jules for task 1603248567528719941 started by @minibota

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