Add calibration options

[mihaic]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces calibration configuration options for the search command, allowing users to enable/disable prefetcher training and select buffer optimization modes.

• Added a mapping from string keys to VamanaSearchBufferOptimization values.
• Exposed two new CLI flags: --no_calibrate_prefetchers and --calibrate_search_buffer.
• Extended search and main to accept and apply the new calibration parameters.

Comments suppressed due to low confidence (3)

src/svsbench/search.py:124

• [nitpick] The --no_calibrate_prefetchers flag uses negative logic, which can be confusing. Consider renaming it to --calibrate_prefetchers with action='store_false' to keep flag names positive and more intuitive.

    parser.add_argument("--no_calibrate_prefetchers", action="store_true")

src/svsbench/search.py:124

• This argument is missing a help string. Adding a help= description will clarify its purpose in the CLI.

    parser.add_argument("--no_calibrate_prefetchers", action="store_true")

src/svsbench/search.py:123

• Add a help= parameter to explain the available buffer-mode options and their effects when calibrating search buffers.

    )

[aguerreb]

Looks good to me.