Extracts generator metadata from the current stack trace.

Returns a map with :test_file, :test_name, and :generator_function keys, or nil if not called from a test.

Example

metadata = GeneratorMetadata.from_stacktrace()
# => %{
#   test_file: "test/mermaid_report_test.exs",
#   test_name: "generates pipeline report",
#   generator_function: "ActorSimulation.MermaidReportGenerator.generate_report/2"
# }

Generates an HTML comment with generator metadata.

Example

comment = GeneratorMetadata.to_html_comment(metadata)
# => "<!--\n  Generated by: test/mermaid_report_test.exs\n  Test: generates pipeline report\n  Generator: ActorSimulation.MermaidReportGenerator.generate_report/2\n-->\n"