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c299a22ea7
The instrument was accumulating defects faster than it was answering questions. Nearly every review finding lived in a seam that existed only because the tracer inferred more than it could observe: a starvation heartbeat, a per-seam guard matrix, DOM-attribute sniffing with a commit generation, click anchors threaded by hand through nine async call sites, and an on-disk JSONL sink with rotation and byte caps. Each fix added a seam, and the next review found the guard that seam was missing. The perf work these numbers support matters more than the numbers, so the instrument is now scoped to what it can measure without inference: - click (or navigation) -> route commit -> settled paint, as a console line plus User Timing marks/measures. That is what the Performance panel and the perf harness read. - the message-window fetch when it starts inside that interval. - one drop rule per unmeasurable condition (hidden window, timeout, superseded, left the surface), each printing why. Removed: the Rust perf-log sink and its git-revision baking, the click-anchor threading and every call site that existed only to carry it, the starvation heartbeat, the roster-fetch attribution and its sequence machinery, and the commit-generation burst gate. Scope bounds are now stated in the module doc rather than inferred: callers that await before navigating are measured from the navigation, a bounded frame wait replaces the 5s render deadline, and a sample past that bound is flagged rather than dropped. Net: 2231 lines removed, 462 added. Signed-off-by: Max Lampert <maxwell@squareup.com>