extend/os/linux/hardware/cpu: typed: strict

[cho-m]

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Also update features to avoid discarding the first flag. This was likely done before 8738ad3 as the capture group used to include the "flags" or "Features" text

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Part of

• Use Sorbet typed: strict in all (non-package) files in Homebrew organisation #17297

[Copilot]

Pull request overview

This PR enables Sorbet's strict type checking for the Linux CPU hardware detection module by upgrading from typed: true to typed: strict. The changes include adding type signatures to all methods and fixing a bug in the features method that was previously discarding the first CPU flag.

Key changes:

• Upgraded type strictness from typed: true to typed: strict
• Added type signatures to all methods in the module
• Fixed bug in features method: changed from flags[1..] (which discarded the first flag) to flags.map(&:intern) (which correctly converts all flags to symbols)
• Added T.let type annotations for instance variable memoization

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[MikeMcQuaid]

Nice work!