Shell completion to suggest installed version feature added (resolves #420) #501
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Summary
Implements bash completion for installed tool versions in tenv. Users can now press TAB after tenv use to see locally installed versions and common strategies like "latest".
Changes Made
Added ValidArgsFunction to use, install, and uninstall commands in cmd/tenv/subcmd.go
Completion shows installed versions (from LocalSet()) plus predefined strategies
Fast completion without file parsing overhead
Dependencies
No new dependencies required. Uses existing:
Cobra CLI framework (already in project)
tenv's version management system
Testing
Verified with both programmatic (tenv __complete) and real bash completion testing.