cli: shell completions for bash and zsh#1
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Walks the argparse definition at print time, so a new flag or subcommand lands in completions without a second list to maintain. Bash output verified with bash -n; zsh emits a standard #compdef file. Covered by parser-driven tests, no new dependencies.
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actbreak --completions bash (or zsh) prints a completion script generated from the argparse parser itself, so flags and subcommands can't drift from a hand-kept list. README documents the source <(...) one-liner for each shell.
Tests assert every subcommand and flag appears in both outputs. The generated bash script passes bash -n. Still stdlib-only.