(v0.3.4) Jupyter / notebook HTML output

env-doctor v0.3.4

Added

• Jupyter / notebook HTML output — from env_doctor import check; check() auto-detects a live Jupyter/Colab kernel and renders a rich, self-contained HTML report inline. Falls back to
  the familiar terminal text report everywhere else.
• CheckReport public API — check() returns a CheckReport with _repr_html_() (Jupyter display protocol), __repr__(), .html (raw HTML string), and .to_dict().
• --format {text,html,json} CLI flag — env-doctor check --format html > report.html for CI reports. --json / --ci unchanged.
• report module — is_notebook() detects Jupyter/Colab kernels; format_result_html() produces inline-CSS HTML with no external deps or JS.
• [notebook] optional extra — pip install "env-doctor[notebook]" pulls in IPython. Core deps unchanged; IPython stays optional and lazily imported.

Changed

• Extracted collect_check_results() and render_check_text() so the JSON, HTML, text, and public API renderers share a single detection pass.
• HTML report header now uses the project SVG logo instead of an emoji.

Full changelog: v0.3.3...v0.3.4