fix: move vouch/skip checks before diff acquisition

[Meru143]

Move --vouch and --skip handling to before any diff acquisition (PR fetch, file reads, git show/diff) so they short-circuit immediately after CLI args are parsed.

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Reviewing files that changed from the base of the PR and between f129e62 and 966e171.

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• src/main.rs

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[Copilot]

Pull request overview

This PR optimizes the argus review command by moving --vouch and --skip flag checks to execute immediately after CLI argument parsing, before any diff acquisition operations (PR fetches, file reads, or git operations). This allows the command to short-circuit early and avoid unnecessary work when these flags are used.

Changes:

• Moved --vouch and --skip checks to execute before diff acquisition operations
• Simplified the vouch output message from a computed format to a static string

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