Detect src layout Python entry points

[Lling0000]

Summary

• detect console script modules under both flat and src-layout Python package paths
• add a regression test for pyproject.toml [project.scripts] pointing to src/ag_cli/cli.py

Why

The scanner used project.scripts entries to infer entry-point files, but only checked flat package paths such as ag_cli/cli.py. Modern Python projects commonly use src layout, including this repository's cli package. When scanning the cli subproject, the entry point was missed and the generated project report lacked the main CLI file.

Validation

• python -m pytest engine/tests/test_hub_scanner.py -q
• python -m pytest engine/tests/test_hub_pipeline.py::test_format_scan_report_includes_entry_points -q
• Manual scan of the cli subproject returns src/ag_cli/cli.py in report.entry_points