feat(ci): Add tests for ud.sh CLI

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Summary

Add automated test coverage for the ud CLI (zsh/ud/ud.sh) so changes to subcommands, help text, and command-printing behavior are caught in CI.

Problem

ud is a daily-driver CLI for Go, Rust, Nibiru, quick editor jumps, Docker helpers, and more. It is installed via symlinks.sh → ~/.local/bin/ud.

There is already a Go test file at zsh/ud/ud_test.go, but it is not wired into root CI (.github/workflows/test.yml runs just test → bun test only). The zsh/ud/justfile has its own just test, but that path is easy to forget.

So ud can regress silently unless someone remembers to run Go tests locally in that subdirectory.

Purpose / Rationale

• Protect a heavily used CLI that wraps many workflows
• Catch breakage in help output, --cmd dry-run behavior, and subcommand routing
• Low cost to run on ubuntu-latest — existing tests already use bash -c "source ud.sh && ..." pattern
• Align ud with how other dotfiles automation is already tested (bun tests, config generation tests)

What exists today

• zsh/ud/ud_test.go — tests help, ud rs test --cmd, ud go test-short --cmd, ud nibi cfg prod, etc.
• zsh/ud/justfile — just test runs go test ./...
• Root justfile / CI — does not include ud tests

What "good enough" might mean (examples, not a spec)

• ud tests run in CI on PRs
• Failures block merge when help text or --cmd output drifts
• Optional: expand coverage for other subcommands over time

Exact runner choice (fold into just test, separate job, matrix) left open.

Out of scope (for now)

• Testing commands that require external binaries (nibid, docker, live network)
• Full integration tests against real Nibiru nodes or Docker Desktop
• Rewriting ud in another language

Acceptance Criteria

• ud.sh test suite runs in CI on ubuntu-latest
• At least the existing Go tests are included (or equivalent coverage)
• Local reproduction is documented or available via just (exact recipe TBD)
• Scope stays on CLI contract / output — not live external service calls

Related

• Symlink testing issue (ud depends on ~/.local/bin/ud link from symlinks.sh)
• feat(ci): Add non-interactive zsh tests to CI #14 — non-interactive zsh testing (overlapping theme: shell CLI safety)