Rendered from docs/obligations/0012-the-human-half-of-the-public-presence-claim-has-no-instrument.md in the Headwater corpus. Every document on this half of the site is typed by the taxonomy the descriptor names: corpus.json.

The human half of the public presence claim has no instrument at all

Context

Q16 settles the public presence of the project. A generated site should let a reader answer "is this for me?" without reading the specification.

Obligation

The Discovery probe category is the instrument for the machine half.

Discharge

The human half has no instrument at all, which is worth a statement rather than a silence. No probe category grades what a person understood from a page, and this project has proposed none.

The machine half has a reading, and it does not separate the arms. The batch of 2026-09-30 graded the two discovery probes in both arms of the campaign tier, 30 sessions of each probe in each arm (#1384). The present arm satisfied 9 of 60 (15.0%, 8.1% to 26.1%). The absent arm satisfied 5 of 60 (8.3%, 3.6% to 18.1%). The difference is +6.7 points, in a 95% Newcombe interval of -5.3 to +18.7 points (the result). The interval contains zero, so this batch does not show that the governance layer helps a cold session find a document.

The reading has limits. 5 of the 60 present-arm sessions and 3 of the 60 absent-arm sessions reached this repository from outside their workspace. That count uses the rule in the Limits section of the evaluation: a call names a copy of this repository, a headwater binary or GitHub. It does not count every path outside the workspace. The corpus was not frozen between the two arms' sessions. docs/spec/12-check-layer.md changed after the recording, so each verdict is graded over a moved read set. The evaluation of that batch states every limit and the cost. This record stays open by the owner's ruling of 2026-09-30, until #1472 runs a discovery selection sized for power. The human half still has no instrument.

The design of #1472 does not discharge this record. That issue declares the component arms of the campaign tier, a power calculation and a dry run that prices the plan. It runs no session, and the owner ruled that this record stays open until the campaign runs.