Fix pkill process completions

[maro20066600]

Fixes #10924

Summary

• Add a pkill command signature backed by process-name completions.
• Prevent pkill from falling back to filesystem paths when process completions are unavailable.
• Apply the fallback guard to both legacy and v2 argument completion paths.

Tests

• cargo fmt --check
• PATH="/tmp/codex-fake-xcrun:$PATH" cargo test -p warp_completer pkill --features test-util
• PATH="/tmp/codex-fake-xcrun:$PATH" cargo test -p warp_completer pkill --features 'test-util v2'

[oz-for-oss]

@maro20066600

This PR is not linked to an issue that is marked with ready-to-implement.

Issue-state enforcement details:

• Associated same-repo issues checked: pkill <TAB> completes filesystem paths instead of process names in Warp #10924

• Required readiness label: ready-to-implement

Readiness check:

• pkill <TAB> completes filesystem paths instead of process names in Warp #10924: missing ready-to-implement; readiness labels present: none

To continue, link this PR to a same-repo issue such as Closes #123 in the PR description, and make sure that issue has ready-to-implement.

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[oz-for-oss]

@maro20066600

This PR is not linked to an issue that is marked with ready-to-implement.

Issue-state enforcement details:

• Associated same-repo issues checked: #10924

• Required readiness label: ready-to-implement

Readiness check:

• #10924: missing ready-to-implement; readiness labels present: none

To continue, link this PR to a same-repo issue such as Closes #123 in the PR description, and make sure that issue has ready-to-implement.

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[maro20066600]

Thanks for the note.

This PR is linked to #10924 and implements a fix for the reported pkill <TAB> filesystem fallback behavior.

Could a maintainer please confirm whether #10924 can be marked as ready-to-implement, or let me know if a different implementation direction is preferred?

Happy to adjust.

[vorporeal]

hi @maro20066600 - changes to command signatures can be made in the https://github.com/warpdotdev/command-signatures repo

[vorporeal]

oops, sorry, github didn't show me the comment where you asked for input - yeah, we'll definitely accept a command signature update for pkill! a maintainer can review the contribution to the command-signatures repo, and then we'll need a PR here to update our dependency on warp-command-signatures to include your change.