Figure — Instrument anatomy

How the ReachScan instrument works

A committed sequential construction is swept along its commitment axis. At each commitment position the instrument samples M futures under a declared policy and budget. Every sample is projected onto multiple diagnostic channels. The channels are stacked into the readout: a profile of the reachable future as commitment accumulates.

ReachScan instrument anatomy A B C D COMMITTED SEQUENTIAL CONSTRUCTION SWEEP AXIS — COMMITMENT FRACTION 0% 2.5 5 10 15 20 25 50 75 100 M ROLLOUTS UNDER DECLARED POLICY AND BUDGET M = 64 continuations sampled budget B = 2048 tokens DIAGNOSTIC PROJECTION CHANNELS residue projection · Y mod 8 answer projection · dominant Y mass scaffold parameter · X = Y/8 semantic mode · classifier output ASSEMBLED PROFILE — IN-FLIGHT TOMOGRAPHY READOUT residue mod 8 dominant answer target-fiber extinction answer-basin lock two events visible: residue closure precedes answer lock by ~25% of the trace
A — Sweep axis

Committed sequential construction

The trace under examination, with checkpoint positions marking each commitment fraction at which the future field is sampled.

B — Sampling operation

Continuation rollouts

At each checkpoint, M futures are sampled under a declared continuation policy and budget. The fan is the local probe.

C — Projection channels

Diagnostic projections

Each sampled distribution is projected onto multiple channels — residue, answer, scaffold parameter, semantic mode — that probe structurally distinct properties.

D — Profile readout

Assembled profile

Channel readouts at each checkpoint are stacked into the profile. Features in the profile — boundaries, plateaus, extinction events — are the measurement output.

Per-measurement receipt

model: declared target: declared policy: declared budget: B tokens M: rollouts per checkpoint checkpoint: commitment fraction distribution: O(P; π, B) projections: q_i(O) hash: chain-of-custody
Reading the diagram. The instrument operates as a sweep across the commitment axis (A). At every checkpoint position, M continuations are sampled (B). Each sample is projected onto multiple diagnostic channels (C). The channels are stacked into the assembled profile (D), where features such as residue closure and answer-basin lock become visible as the structural signature of commitment-induced reachability change. The entire measurement is bound to a declared policy, budget, and target; receipts ensure replayability.