ADR-005: Fleet becomes an example

• Status: Accepted
• Date: 2026-08-28
• Source: #1, issue description, section “Decisions (ADRs, continuing the numbering of the May design doc)”

Context

From the state of the repository recorded in #1 when the decision was taken (verified 2026-08-28):

nix flake check --no-build fails: every hosts/edgenode-0*/configuration.nix imports a hardware-configuration.nix that is not in the tree. CI has failed on both pushes (runs 25826332473, 25826848922).

colmena output declares nodes without importing any module.

Decision

The Sensorica fleet (5 hosts + workshop ISO + colmena hive) moves to examples/sensorica-fleet/ with its own flake.nix that takes the root flake as input. The root flake keeps modules, templates and VM checks only, so a community user never evaluates Sensorica hosts. Committed hardware-configuration.nix stubs make each host evaluate; the example README documents replacing them with nixos-generate-config output.

Consequences

The record states no consequences beyond the decision itself.