Working directory and paths

Prof uses the current working directory to find the Go module and to write bench/. Run from the same place you run go test for that module (usually the module root).

• Benchmark discovery: module-relative to cwd.
• Output: bench/<tag>/ under cwd (terminology).
• Config: prof setup writes config_template.json next to go.mod at the module root—keep cwd aligned with that root.

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Collect profiling data