Replace mitchellh/cli With Internal CLI Package - #405
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Match mitchellh/cli behavior by displaying help when an unknown command is encountered, instead of silently returning exit code 127. - Add help output in CLI.Run() when command lookup fails - Add test to verify HelpFunc is called for unknown commands - Improves user experience with immediate feedback on typos
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[CORI2-3216]
mitchellh/cli is archived and pulls in a transitive dependency with a known vulnerability: GO-2026-5932 via posener/complete → golang.org/x/crypto/openpgp. No fixed version of mitchellh/cli exists.
This PR removes the dependency entirely and replaces its functionality with an internal package at internal/cli, preserving all existing logic and signatures.
PCI review checklist
If applicable, I've documented a plan to revert these changes if they require more than reverting the pull request.
If applicable, I've worked with GRC to document the impact of any changes to security controls.
Examples of changes to controls include access controls, encryption, logging, etc.
If applicable, I've worked with GRC to ensure compliance due to a significant change to the in-scope PCI environment.
Examples include changes to operating systems, ports, protocols, services, cryptography-related components, PII processing code, etc.