refactor(cmd): Rename util_ prefixed files to descriptive names

.tasks/done/2026-02-17-rename-util-validate.md

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+---
+title: Rename cmd/util_*.go files to descriptive names
+status: done
+created: 2026-02-17
+updated: 2026-02-17
+---
+
+## Objective
+
+`cmd/util_validate.go` needs to be renamed. The current name doesn't
+follow the project's naming conventions for cmd/ files which use the
+pattern `client_*.go`, `api_*.go`, `worker_*.go`, etc.
+
+## Tasks
+
+- [x] Determine correct name based on what the file does and where it
+      fits in the command hierarchy
+- [x] Rename the file
+- [x] Update any references/imports
+- [x] Verify tests still pass
+
+## Outcome
+
+Renamed all three `util_` prefixed files to descriptive names, matching
+the convention used by major Cobra CLI projects (Docker CLI, NATS CLI):
+
+- `cmd/util_validate.go` → `cmd/validate.go`
+- `cmd/util_log.go` → `cmd/log.go`
+- `cmd/util_ui.go` → `cmd/ui.go`
+
+No import changes needed — all files are in `package cmd`. Build, tests,
+and vet all pass.