fix: avoid mojibake in Windows terminal status output

[Bortlesboat]

Summary

• replace unicode status glyphs with ASCII markers ([OK], [ERR], [INFO], [WARN]) in shared CLI helpers
• replace em dash in verbose progress output with ASCII - for safer rendering across terminals
• keep behavior unchanged except output formatting

Why

Issue #168 reports garbled output on Windows PowerShell. This keeps status text readable in non-UTF terminal paths and log collectors.

Validation

pm ci`n-
pm test (existing upstream failures in installer-target tests + Node OOM; unrelated to this formatting-only change)

[colbymchenry]

Thanks for the patch! Superseded by #178, which keeps the spirit of your fix (ASCII markers for status icons) but extends coverage to src/ui/shimmer-worker.ts — the worker thread is the actual source of the mojibake in #168's screenshot because it uses fs.writeSync(1, …) and bypasses Node's TTY-aware UTF-8→codepage conversion on Windows. It also adds a supportsUnicode() check so macOS/Linux terminals keep the Unicode rendering.

You're credited in the CHANGELOG entry that ships in 0.7.10. Closing this one in favour of the merged fix.