[marcelverdult]

Docs only, no code.

• 0010: new section "Step 10d" as a proposal. A known command whose frame is shorter than its minimum would answer ILLEGAL_ARG (6) instead of UNSUPPORTED_CMD (1), as docs/companion_protocol.md already documents for a bad length. Unknown codes and handlers that return false keep code 1. Client check of meshcore.js 1.15.0, meshcore_py, meshcore-cli and KiekR: none relies on code 1 for a short frame; the one detection through code 1 (meshcore-cli set_flood_scope) always sends at least the minimum. The Android/iOS apps and the web client were not checked.
• 0010: the number of codes whose short frame answers UNSUPPORTED_CMD is 43 (the rows of the inventory), not 54.
• 0011: Refactor GPS management out of EnvironmentSensorManager into LocationProvider hierarchy meshcore-dev/MeshCore#1799 was closed on 01.11.2026 without a merge. The GPS code is being reworked in Big GPS refactor meshcore-dev/MeshCore#3753 (89 files, 65 under variants/, new GpsDriver classes and CommonGpsPrefs), so E2 stays not built until Big GPS refactor meshcore-dev/MeshCore#3753 is merged or closed.