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Michał Pierzchała
b12a3e3cb3
* test: pin test files over 1,000 lines at their exact length so they can only shrink AGENTS.md has said for a while that past 1,000 lines is architecture debt and tests are not exempt; nothing enforced it, and the second-largest test file gained 55 lines in the PR before this one. This is the slow-test ratchet's shape for a reader's context instead of wall clock: the 26 test files over the tripwire are pinned at their exact length (R9-style equality pin, #1781 A6); growth fails, shrink fails until the pin is lowered in the same PR, a file that drops under the line leaves the list, and a new file may not cross it. One directory walk per unit run, ~250ms; the pin list emptying deletes it. * test(ratchet): hold giant test files to their merge-base length so pin edits cannot admit growth Review (P1): the equality pin compared measured lengths only against the pin map in the same checkout, so growing a file and raising its pin, or adding a new >1,000-line file with a pin, stayed green. The gate is now history-backed: every test file over the tripwire may be no longer than at the merge-base with origin/main (renames followed; new files may not cross the line), and no pin may exceed its file's base length — one git cat-file --batch spawn, parsed by bytes because the sizes are bytes. Both bypasses planted red against real git on a pinned file and on a fresh 1,001-line file with a pin added. * test(ratchet): a pin on a file at or under the tripwire is itself a finding Review: a new pin for an unchanged sub-tripwire file (900 pinned at 900) passed equality and history and grew the map. Pins now exist only for files over the tripwire — any other pin is red with 'remove it' — which also subsumes the old shrink-under-the-line message. Planted red in-file and against real git (a 186-line test pinned at 186). The android snapshot test pin bootstraps 1636→1660: main grew that file in #1846 before this gate exists, and history agrees (1660 at the merge-base).