Add HTML Report Export to CLI with Agent Thoughts and Modular Template

[ashutosh-rath02]

Summary

This PR adds support for exporting test results as an HTML report via the --output-html flag in the Magnitude CLI. The report includes a summary, detailed per-test results, step/action/check breakdowns, and agent thoughts (reasoning) for each step. Related to #90 #11

Changes

• Add --output-html <file> flag to the CLI. (npx magnitude --output-html results.html)
• Generate a detailed HTML report after test runs, including:
  • Test summary (passed/failed/total)
  • Per-test results with status and errors
  • Step/action/check breakdowns
  • Agent thoughts (if available) under each step
• Add HTML template and rendering logic to src/runner/htmlReport.ts.
• The output results.html is stored in root directory (location and report name TBD)

Notes

• Agent thoughts will appear if the agent produces reasoning during test execution.
• No frameworks used for HTML generation—just a simple string template.

Screenshots

Below is the screenshot of a dummy test that I created

import { test } from 'magnitude-test';

test('visit example.com and check title', { url: 'https://example.com' }, async (agent) => {
    await agent.check('should see Example Domain');
}); 

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It would be great if any of the maintainers clone my branch to run an actual test with llm runs to test the thought. I do not have api keys as of now😅.