Build log.

Short, high-signal build logs. What changed, what broke, what improved, what's next.

BOARD / FIELD NOTES

The duty-day toggle

How the site's light-mode palette works, why it is an opt-in rather than a system preference follow, and what the name means.

22 Apr 2026READ ->

Design

The hardware standard

Why Keystone commits to a public hardware family and what that means for repair in the field.

15 Apr 2026READ ->

Architecture

Power budget: HMD-1

How the Sentinel HMD-1 power architecture is being sized, and why the constraints are harder than they look.

8 Apr 2026READ ->

Design

Webbing: the 25mm standard

Why Keystone uses 25mm MIL-spec webbing throughout, and what that choice rules in and out.

20 Mar 2026READ ->

Web

Console UI: building the configuration interface

Design decisions behind the Sentinel HMD-1 web configuration console — local-first, single-file, 68KB uncompressed.

18 Mar 2026READ ->

Architecture

Sentinel architecture: single-cable decision

The reasoning behind collapsing power and data onto a single USB-C connection in the HMD-1 architecture — and the specific numbers that made it viable.

5 Mar 2026READ ->

Field

Fourth-season design principles

What it means to design for the fourth season, and the constraints that follow from taking it seriously.

1 Mar 2026READ ->

Revision

Keystone A03→A04: weight claim downgrade and what changed

A03 shipped with a 1,340g total weight TARGET. Physical build of A04 came in at 1,387g. This is what we changed and why we didn't fight it.

27 Feb 2026READ ->

Design

Keystone layout iteration: why the clamshell won

Three layout variants, two fabrication rounds, and the failure mode that settled the architecture.

14 Feb 2026READ ->

DROP LIST / LAB

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