Core paper is included as whitepaper/lineum-core.md (manuscript text and figures intended under CC BY-NC-ND 4.0). Software and scripts are AGPL-3.0-licensed. The display-only effective mass is a pure unit conversion from the canonical tone f0 (m = h f0 / c^2, m/m_e as a scale cue) and is explicitly not a rest-mass claim. Structural Closure is in scope for the v1.0.x core as an operational consequence of the φ center-trace half-life metric. Phenomena such as Return Echo, Dimensional Transparency (time-varying κ), and other extensions live in the experimental/extension track (lineum-exp-*, lineum-extension-*) and are out of scope for this core bundle.

Reference implementation of the Lineum core (v1.0.19) with canonical HTML reports and CSV/PNG/GIF artifacts. The core paper (whitepaper/lineum-core.md) is the methodological spine: it fixes the canonical tone f0, SI conversions (E, λ, display-only m/m_e), Structural Closure as an in-scope consequence of the φ center-trace half-life, and falsifiable checks (C1/C2/C3). Evidence lives in output/; each HTML report is ground truth, commit-stamped, and tied to a specific RUN_TAG.