fix: handle emoji/special-character PDF paths in ASCII terminals

[ambicuity]

Summary

• fix CLI output encoding so successful encryption does not fail when terminal output is ASCII-only
• safely render emoji/special-character paths using escaped fallback text when needed
• add unit + integration tests for PYTHONIOENCODING=ascii with emoji file paths
• update README Known Issues to reflect current behavior

Why

Issue #23 reports that special characters/emojis in file paths cause a minor complaint during execution.
Root cause: success logging attempted to print non-ASCII paths directly, which can raise UnicodeEncodeError in ASCII output environments and incorrectly return a failure exit code.

Validation

• poetry run coverage run -m unittest discover tests
• manual reproduction with real PDF + emoji paths under PYTHONIOENCODING=ascii now returns exit code 0 and writes output successfully

Closes #23

[Copilot]

Pull request overview

This PR fixes a CLI exit-code regression where printing success/error messages could raise UnicodeEncodeError in ASCII-only output environments when file paths include emoji/special characters, causing a false failure despite successful encryption.

Changes:

• Add _stream_safe_text / _safe_print helpers and route CLI messaging through them to avoid encoding exceptions.
• Add unit + integration coverage to validate ASCII-only stdout behavior with emoji paths.
• Update README “Known Issues” to reflect current behavior (emoji paths supported; PDF-object warnings may still appear).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
passifypdf/encryptpdf.py	Introduces encoding-safe printing for CLI success/error output to prevent UnicodeEncodeError from impacting exit codes.
tests/unittests/test_encryptpdf.py	Adds a unit test that runs main() with ASCII-only stdout/stderr and verifies escaped output + success exit code.
tests/integrationtests/test_encryptpdf_integration.py	Adds a subprocess integration test with PYTHONIOENCODING=ascii to ensure the CLI succeeds and produces an escaped path.
README.md	Updates “Known Issues” to remove outdated emoji-path warning and document current behavior.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.