Description

Add shell completion support for all commands, subcommands, and arguments using clap_complete.

Details

• parsec config completions zsh outputs completion script
• Tab-complete command names: parsec sw<TAB> → switch
• Tab-complete ticket IDs for commands that take <ticket>: parsec switch <TAB> → list active tickets
• Support zsh, bash, fish

Implementation

• Add clap_complete dependency
• Add ConfigAction::Completions variant
• Generate completions from clap Command definition
• For dynamic ticket completion, use parsec list --json as source

Priority

Low difficulty, high impact