Patch on top of v0.1.3. The calculations are unchanged — 0.1.3's math was verified against the registry build and is correct.
0.1.3 announced itself as 0.1.2: the release bumped package.json and missed the hand-written constant that --version, the CLI header and the exported ENGINE_VERSION all read.
A test now asserts the constant equals package.json's version, so the two cannot drift again — the same shape as the solar-term guard added in 0.1.3: assert the relationship, not the value. 29 tests.