[Feature] Jupyter / Notebook Integration

[mitulgarg]

Summary

Enable env-doctor check to render rich HTML output when running inside Jupyter/IPython notebooks instead of terminal-formatted text.

Motivation

Data scientists and ML engineers frequently work in Jupyter notebooks. Currently, running !env-doctor check in a notebook produces raw terminal output with ANSI escape codes that render poorly. Native HTML output
would make env-doctor a natural part of the notebook workflow.

Proposed Implementation

Runtime Detection

• Detect Jupyter/IPython environment:

  def is_notebook():
      try:
          from IPython import get_ipython
          shell = get_ipython().__class__.__name__
          return shell == 'ZMQInteractiveShell'  # Jupyter
      except (ImportError, AttributeError):
          return False

HTML Output Formatter

• Create format_result_html(result: DetectionResult) -> str utility
• Use inline CSS for portable HTML (no external stylesheets)
• Color-coded status badges: green (success), yellow (warning), red (error)
• Collapsible sections for detailed metadata
• Render via IPython.display.HTML()

Python API

• Expose a simple Python API for notebook use:
  from env_doctor import check
  check() # auto-detects notebook, renders HTML
• Falls back to terminal output if not in a notebook

CLI Flag

• Add --format html flag for explicit HTML output (useful for CI reports too)

Acceptance Criteria

• Auto-detects Jupyter environment and switches to HTML output
• from env_doctor import check; check() works in notebooks
• HTML output is self-contained (inline CSS, no external deps)
• All existing check information rendered (status, versions, issues, recommendations)
• Terminal output unchanged when not in notebook
• --format html flag available for explicit HTML output

[mitulgarg]

Closed with #137