Update hunt to use targetted benchmarks

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What does this PR do?

Enhances the Lading Optimization Hunt skill documentation with more specific guidance for benchmark targeting and execution. The updates include:

• A critical note emphasizing that optimization targets must have an associated criterion benchmark
• A comprehensive table mapping source modules to their corresponding benchmark targets and fingerprint config directories
• Streamlined benchmark commands using environment variables for consistency
• Instructions to run only the relevant benchmark target instead of the full suite

Motivation

To improve the efficiency and accuracy of the optimization process by ensuring developers:

1. Select appropriate targets with measurable benchmarks
2. Use consistent configuration between baseline and optimized runs
3. Focus only on relevant benchmarks rather than running the entire suite

Additional Notes

The updated documentation provides a more structured approach to benchmarking, which should lead to more reliable performance comparisons and better optimization outcomes.

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• Example optimization hunt #1762
• Update hunt to use targetted benchmarks #1761 👈 (View in Graphite)
• Optimize benchmarks #1760
• Split benchmarks into individual targets #1759
• main

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[preinlein]

The stack can be validated by looking at the final Claude hunt results here: https://drive.google.com/file/d/1mbgFAFuC5s2HwM3IhoNCgqZcmt7Ho7a2/view?usp=sharing