playground-api-tab.test.tsx's SSE test always took the disabled-button branch
(the fetch mock returned an empty model list) and asserted a tautology instead
of exercising the SSE path it claims to verify. The test now selects a real
model to enable Send, asserts it is actually enabled, and asserts the streamed
SSE content reached the response editor.
check-test-masking.mjs's tautology subcheck only compares base-vs-HEAD counts
within a PR's own diff and no-ops entirely outside PR context (no
GITHUB_BASE_SHA/REF) -- so a tautology merged once, or checked with a bare
local run, stayed invisible forever after. Added an always-on absolute-floor
scan (scanBareTautologies/countBareTautologies) over every tracked test file,
scoped to the bare expect(true).toBe(true)/assert.equal(1,1) patterns that
have zero legitimate uses in this codebase -- deliberately excluding
assert.ok(true), which has ~15 pre-existing verified-legitimate
try/catch-fallback uses and stays on the lenient diff-only path.
ebdfe727a6