feat: add Colima sizing flags to local start

[patrickleet]

Summary

• add hops local start --cpus/--cpu --memory --disk sizing options
• detect already-running Colima instances and prompt or --yes restart when requested sizing differs
• add hops local resize for explicit non-destroying resize flows
• reject disk shrink requests before invoking Colima

Tests

• cargo test (93 passed)
• cargo check
• cargo run --quiet -- local start --help
• cargo run --quiet -- local resize --help
• cargo run --quiet -- local start --cpu 12 --memory 32 --disk 100 --help

Live Colima resize was not run.

[coderabbitai]

Caution

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/colima-sizing

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