Handle ASCII help output streams

[puneetdixit200]

Fixes #1411.

Summary:

• Fall back to ASCII-safe escape sequences when argparse help text is written to a strict ASCII stream.
• Add a regression test for http --help with ASCII-only stdout.

Tests:

• python -m pytest tests/test_httpie.py::test_help tests/test_httpie.py::test_help_with_ascii_stdout -q
• python -m pytest tests/test_httpie.py -q
• python -m pytest tests/test_cli.py -q
• python -m pytest tests/test_cli_utils.py -q
• python -m flake8 httpie/cli/argparser.py tests/test_httpie.py
• git diff --check

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.10%. Comparing base (4d7d6b6) to head (e3ac637).
⚠️ Report is 383 commits behind head on master.

Files with missing lines	Patch %	Lines
httpie/cli/argparser.py	70.00%	3 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1852      +/-   ##
==========================================
- Coverage   97.28%   94.10%   -3.19%     
==========================================
  Files          67      113      +46     
  Lines        4235     7712    +3477     
==========================================
+ Hits         4120     7257    +3137     
- Misses        115      455     +340     

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[puneetdixit200]

Added coverage for the remaining ASCII help output branches in BaseHTTPieArgumentParser._print_message.

Local checks run:

UV_CACHE_DIR=/tmp/httpie-1852-uv-cache PIP_CACHE_DIR=/tmp/httpie-1852-pip-cache uv run --python 3.12 --with '.[dev,test]' python -m pytest tests/test_httpie.py::test_help_with_ascii_stdout tests/test_httpie.py::test_help_message_encodes_binary_stream_without_buffer tests/test_httpie.py::test_help_message_reraises_non_text_unicode_errors tests/test_cli_ui.py::test_naked_invocation --cov=httpie.cli.argparser --cov-report=term-missing -q\nUV_CACHE_DIR=/tmp/httpie-1852-uv-cache PIP_CACHE_DIR=/tmp/httpie-1852-pip-cache uv run --python 3.12 --with '.[dev,test]' python -m pytest tests/test_httpie.py tests/test_cli_ui.py tests/test_encoding.py -q\nUV_CACHE_DIR=/tmp/httpie-1852-uv-cache PIP_CACHE_DIR=/tmp/httpie-1852-pip-cache uv run --python 3.12 --with '.[dev,test]' python -m flake8 tests/test_httpie.py\ngit diff --check\n```\n\nThe focused coverage run no longer reports the changed `_print_message` fallback lines as missing.

[puneetdixit200]

Follow-up for the red macOS matrix: the jobs were still targeting the retired macos-13 runner and were canceling after 24 hours without logs or steps. I moved the matrix to macos-15-intel, which keeps the Intel macOS environment while using a supported runner label.\n\nLocal validation for this CI-only change:\n\n\ngit diff --check\nruby -e "require 'yaml'; YAML.load_file('.github/workflows/tests.yml')"\n\n\nNew CI is running on head 2f300ec: https://github.com/httpie/cli/actions/runs/26440024081

[puneetdixit200]

Follow-up on the macOS dependency setup failure from the first replacement run: test (macos-15-intel, 3.9, 1) reached install and failed while brotlicffi was being built through setuptools' legacy fetch_build_eggs path. I pushed 4122d86 to make the dev dependency install use pip's PEP 517 build path.\n\nValidation run locally in a temp Python 3.9 venv:\n\n\npython -m pip install --upgrade "pip<25.3; python_version<'3.10'" "pip; python_version>='3.10'" setuptools wheel build\npython -m pip install --use-pep517 --no-binary=brotlicffi brotlicffi\n\n\nThat forced source build completed successfully with brotlicffi-1.2.0.1, cffi-2.0.0, and pycparser. Latest CI is running on head 4122d86: https://github.com/httpie/cli/actions/runs/26440591693