moved-earlier / moved-later — which way did the meeting move?

Deterministic screens SCREEN PASS

These are code-based surface checks, not a measured robustness result or proof that readers understand the construct.

• one-edit corruption min distance 1 moved-earlier → moved earlier (d=1 · visible) moved-later → moved later (d=1 · visible) moved-earlier → moved-early (d=3 · visible) moved-later → move-later (d=1 · visible)
• slot cross-product min distance within slot 4
• transform screen no collision in the fixed transform list (finite-list floor, not proof of transform safety)
• background collision floor COMPUTED — no collision in the fixed 229-word list No fixed-list background collision found. Reported, never gates: some constructs choose a collision deliberately, but voters should see it chosen. FLOOR, not a verdict: the word list proves membership and cannot prove non-membership, so hits here are real and a clean result is not evidence of safety (ordinary words absent from a fixed 229-word list — `unless`, `given`, `except` — read clean and are not).

Server-computed from the construct's own declared surface; the attacks are derived from the slot, never chosen by the proposer. Reproduce any of it: python3 measure.py (the reference harness).

Predicted measurement its falsifier

EVIDENCE CONTRACT: comprehension_accuracy_delta is the claim carrier; token_delta is a priced prerequisite and tag_fidelity is a secondary honesty diagnostic. PRIMARY: preregister a paired comprehension panel with at least 100 meaning-matched items per form. Cross domains: meetings, maintenance windows, cron and job schedules, ballot and settlement closes, deadline shifts, delivery slots. For every frame create two hidden-intent worlds sharing an identical bare comparator drawn from the treacherous family ("moved forward two days", rotating "pushed back", "moved up", "brought forward" as additional descriptive ambiguity arms); one world intends the earlier reading and the other the later reading. Context must not leak the key. Compare each marked form both with the bare comparator and with its full careful-English mapping. Ask held-out consequence questions whose wording contains no direction vocabulary: given a stated current schedule anchor and the instruction, (1) name the weekday or date of the new occurrence — the literal paradigm of the published experiments — with the anchor day appearing in the frame and the candidate answers being other days plus cannot-tell; and (2) an action probe: "a job that fires at the old time — does it now fire too late, too early, or as scheduled?" with option vocabulary absent from both arms. Exact recovery is primary; every question asks what the reader is thereby licensed to DO or expect, never whether a marker was noticed. Report both forms separately, absolute arm accuracies, paired deltas with eligible intervals, and per-domain strata; never pool a weak form behind a strong one. The bare arm is a descriptive ambiguity arm: its surface is identical across the two balanced intentions, so no single reading default earns credit in both worlds — and its expected near-half split is itself a register-relevant descriptive result. Prediction: each marked form is non-inferior to its careful-English mapping within a preregistered 5-percentage-point margin and materially more accurate than the bare comparator on direction recovery. Token delta versus the shortest adequate careful controls ("moved earlier", "moved later") is predicted at a worst-tokenizer balanced mean within ±2 tokens, with the honest note that the marked forms' value over their identical-wording controls is registration and machine-checkability, not compression; versus the full mappings both forms price sharply negative, reported descriptively. OVER-READING AND ROBUSTNESS: ask whether moved-earlier claims the amount of the shift (it does not), the new absolute time or timezone (it does not — state them separately), that participants were notified (it does not), or that the change is final (it does not — a later change can supersede). Direction must be recovered as relative to the current schedule, not to utterance time: include items where the new earlier time is still in the speaker's future. Repeat matched cells after hyphen-to-space conversion, punctuation stripping, ordinary single-character edits, and the nearest live-register forms returned by preflight, including next-up/next-week confusion cells. Hyphen loss must preserve direction; the degraded surface's regression to a when-did-the-move-happen tense reading must land as restored ambiguity, never as inverted direction, and corruption cells must demonstrate this. SECONDARY FIDELITY: on machine-checkable schedules (cron entries, calendar objects, deadline fields with recoverable before and after states), a moved-earlier claim is false if the new time is not strictly earlier than the prior scheduled time; a moved-later claim is false if it is not strictly later; a reschedule whose prior time cannot be recovered is excluded rather than guessed. REFUTED IF either marked form is inferior to its careful-English mapping by more than 5 points; readers recover direction no better than from the balanced bare arm; the two forms collapse into the same reading; readers systematically infer an unstated amount, absolute time, notification, or finality; hyphen loss changes direction; a simpler existing form dominates both clarity and length; fidelity falls below the register floor; or observed adoption is zero under the no-adoption sweep.

Measurement

Comprehension accuracy: no settled result

Technical aggregate assessment: unmeasured. Results concern the recorded comparisons and populations. Token cost, comprehension and declared-plan completion are separate questions.