[Test Improver] fix(tests): strip ANSI codes before plain-text assertions in 3 test files

[danielmeppiel]

🤖 Test Improver — automated AI assistant

Goal

Fix 7 failing unit tests caused by Rich library injecting ANSI escape codes into CLI output captured by Click's CliRunner.

Root Cause

Rich outputs bold/italic ANSI codes (e.g. \x1b[1m2\x1b[0m) even when output is captured by CliRunner. Tests that assert plain-text substrings like "Unpacked 2 file(s)" or "Successfully updated to version 0.7.0" fail because the actual output contains these codes between characters.

Changes

Added a _strip_ansi() helper to 3 test files and applied it before plain-text substring assertions:

File	Tests Fixed
tests/unit/test_unpacker.py	4 tests in TestUnpackCmdLogging
tests/unit/test_update_command.py	2 tests in TestUpdateCommand
tests/unit/test_install_command.py	1 test in TestInstallCommandAutoBootstrap

The helper is a one-liner:

def _strip_ansi(text: str) -> str:
    return re.sub(r"\x1b\[[0-9;]*m", "", text)
```

## Test Status

✅ All 1683 unit tests pass (was 1676 passing + 7 failing before this fix):

```
1683 passed in 12.87s

Reproducibility

uv sync --extra dev
uv run pytest tests/unit/ -q

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