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This was left deliberately partial because `fast-gates` had never been measured,
and guessing is what produced gap 19 in the first place. Measured now, and the
evidence is cleaner than expected:
fast-gates, 160 quality.yml runs .... ZERO self-hosted samples
every non-skipped one is "GitHub Actions NNNN"
median duration, 72 successful runs .. 5.6 min hosted
The classifier is not at fault — in the same window ci.yml's Build demonstrably
ran on omniroute-113-7 and omniroute-113-6, so self-hosted runs are visible when
they happen. The USE_VPS_RUNNER expression on this job was dead configuration.
And had it ever fired it would have inherited the measured penalty, because this
job's first two steps are exactly the bottleneck:
actions/setup-node on .113 with 4 concurrent runners .... 20m06s
actions/setup-node hosted .............................. 16s
So it is pinned rather than switched, and the second variable the gap proposed
(USE_VPS_RUNNER_BUILD / _TESTS) turns out to be unnecessary. After this the
variable governs exactly five jobs, all of them build-like:
ci.yml:build · quality.yml:build · npm-publish:publish
nightly-release-green: release-green, main-green
One variable, one meaning: "this job needs the .113's memory". A guard test pins
that — it fails if the variable is ever attached to a test-like job again, and it
also asserts the build KEEPS it, so nobody closes this gap by removing the
variable outright.
node --import tsx/esm --test tests/unit/vps-runner-variable-scope.test.ts # 3 pass
check:workflows --ratchet → 178, baseline 190