5.1 The three parts and the placement rule (TPS 0.1.0)

Instruction artifact: TPS 0.1.0, page 5.1 The three parts and the placement rule. Part of TPS 0.1.0 and the TPM hub. Human-only edit (TPS 5.13). Version 0.1.0, proposed; declaration pending. Governing section: this page, TPS 5.1. The text below is this page's unit of the TPS 0.1.0 artifact, verbatim; the whole artifact and its file digest are on The Principia Machina/TPS 0.1.0.

TPS 5.1  THE THREE PARTS AND THE PLACEMENT RULE
purpose: PLATFORM, TPX, PRB; every deterministic responsibility is
         TPX's; the platform limits carried by design
governs: 5.1 | version: 0.1.0 (proposed) | class: instruction artifact
audience: operator, agent

5.1.1  The Public Recorder is layer 5. It has three parts: PLATFORM, TPX,
       PRB (see 1.1). [I-044] [I-045] [I-046] [I-047]
5.1.2  The Public Recorder presents the UI through MediaWiki and owns
       every UI process MediaWiki does not handle natively: invoking the
       CAC, returning a rejected component to its author, allowing a
       passing TFK to be initialized with a UUID. [I-049]
5.1.3  PLACEMENT RULE. Every deterministic responsibility MediaWiki can
       host is TPX's: every MECHANICAL row of the check-class matrix
       (see 4.2); every digest, TPX being the sole implementation; the
       UUID; instantiation; the fencing check at the landing API; expiry
       evaluation; the manifest and badge, rebuilt at every landing with
       the badge last; D(IS), computed and published; canary planting at
       the declared rate. No external script holds any of these. [I-050]
5.1.4  Platform limits carried by design: PHP work lives inside a web
       request; MediaWiki has no daemons and no cross-page transaction,
       so instantiation and landing are sequences with the badge written
       last as the commit marker; an external binary runs only under the
       shell framework's limits (see 7.1). [I-055] [I-131]