feat(cli): add completion command

[MunifTanjim]

Why?

I like to manage my own shell setup, so I do this:

sentry cli setup --method brew --no-modify-path --no-completions --no-agent-skills

But currently there's no way to get the completion script without letting sentry cli put it on the filesystem for me.

Adding sentry cli completion command solves that. It is a common pattern for most popular CLIs.

Summary

Adds sentry cli completion <shell> to print the shell completion script to stdout for bash, zsh, and fish. When no shell argument is given, the shell is auto-detected from $SHELL.

This complements sentry cli setup (which writes completion files to disk) by letting users and package managers install completions however they like:

sentry cli completion zsh > ~/.zfunc/_sentry
eval "$(sentry cli completion bash)"

Details

• New command in packages/cli/src/commands/cli/completion.ts, registered under the existing cli route group next to setup/uninstall.
• Reuses the existing getCompletionScript() generator (lib/completions.ts) and detectShellType() helper (lib/shell.ts) — no new generation logic. Output is byte-identical to what cli setup writes.
• auth: false; unsupported shells fail with a ValidationError listing the supported shells.
• Regenerated skill/command docs (cli.md, SKILL.md, contributing.md) via pnpm run generate:docs.

Testing

• packages/cli/test/commands/cli/completion.test.ts — covers bash/zsh/fish output, the unsupported-shell error, and $SHELL auto-detection. All pass.
• tsc --noEmit and biome check clean.
• Manual smoke test: each shell prints its script, nonsense errors with a non-zero exit, and sentry cli --help lists the command.

[vercel]

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