test(genspec-tui): count every allocation when checking attribution

[fredbi]

TestProfilerCapturesARun allocated a megabyte and asserted that the profiler attributed it. At the default rate the heap profiler samples one allocation per 512 KiB, so that megabyte is a Poisson draw with a mean of two, and the profile comes back empty about one run in seven — measured at 4 failures in 30 runs locally, independently of the toolchain.

Pin MemProfileRate to 1 for the test, as the fabricated-record tests alongside it already do, so the assertion is about attribution rather than about luck. The runtime honours rate 1 from the very next allocation, with no threshold carried over from the previous rate.

Nothing in the profiler changes: sampling is what the default rate means, and a phase whose sites were not sampled already says so on the card.

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Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

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• I have added tests to cover my changes.
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