Mesh and node config may hold values only for keys on a fixed, reviewed list (hq ADR 0348 clause 7, design 57 package K2, issue 661). predefined.json at the root starts with font-size (a number of points, 6 to 72) and agent-managed-settings (a trusted object). The merge check refuses a change that removes a key a manifest still names, against the trunk's list at the merge base; whether a removed key still holds a value is mesh-config's to refuse (package K3). Part 1 of 2.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
