comprehensive completion generation: native, manpage, --help
Three-strategy pipeline with priority: native completion generators
(e.g. CMD completions nushell) > manpage parsing > --help fallback.
Single `generate` command produces one module-wrapped .nu file per
command. Parallel execution scaled to cores, 200ms timeouts, ELF
string scanning to skip binaries without -h support, native gzip
decompression via camlzip, SYNOPSIS-based subcommand detection,
nix3 manpage strategy, deduplication, nushell builtin exclusion.
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