Changelog #

0.1.0 #

First release — the trajectory log substrate (tg-zfek). A leaf package: zero grid_* dependencies, by decision (grid-trajectory-leaf-package).

The §1 envelope and the sealed §2 record codec: 50 record types across the attempt, admission, verification, step, and effect families, keyed (record_type, type_version) with checked-in golden fixtures. Old decoders are kept forever — a breaking change ADDS a version, never replaces one — and an unknown pair decodes to OpaqueRecord, so replay never throws.
The §5 fenced append client over the §4 DDL bootstrap: epoch claim, T6i counter-CAS, the terminal guard, a resolving pre-read, belt predicates, and the dolt-commit cadence.
Fold projections — session-head, step-cursor, process identity — with their delta types and lag accounting, plus quiesce-only replay.
The service tick and its obligation query, the shadow readers, and the traj verbs: provision, show, shadow-diff, replay, and gc.