feat: add import resolution tracer (pywho trace)#1
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New `pywho trace <module>` subcommand that explains where an import resolves and why. Includes sys.path search order, module classification, cache detection, and shadow warnings. - tracer.py: core trace engine with trace_import() API - trace_formatter.py: colored terminal output for trace reports - CLI: `pywho trace <module>` with --verbose and --json flags - 21 new tests (53 total) - Updated README, docs, API reference, and CHANGELOG - Version bump to 0.2.0
On macOS system Python, site-packages lives under the same prefix as stdlib. Check for 'site-packages' in origin path first to correctly classify third-party packages on all platforms.
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Summary
pywho trace <module>subcommand that explains where an import resolves and whytrace_import()Python API withTraceReportdataclass--verboseflag for full sys.path search log,--jsonfor machine-readable outputTest plan
pywho trace json,pywho trace pytest,pywho trace nonexistent