docs(rust): §3 walked on the rigs, and D212 (the full dome is the default)

PLAN_REDESIGNS §3.4: the rig rows as walked 2026-09-29 without a player,
the dome types, D212, and the in-game rows deferred to the later in-game walk.
PROTOCOL §19.11: dome type 0 when absent; walk status.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

rust-link/PROTOCOL.md

@@ -2281,7 +2281,8 @@ both, **`zonemanager.ignoreflag.nokits` belongs to ZoneManager**.
   to chat**; the zone is not refused for it, because the moment the message is said can be days after the
   step ran. **`format`** is the chat voice (§33.2 of PLAN.md), one `{message}`, used only for chat.
 - **`dome`** asks ZoneDomes for a dome over the zone: `type` is ZoneDomes' own sphere type (0 Standard,
-  1 Red, 2 Blue, 3 Green, 4 Purple) and `stack` 1–10 spheres (1 when absent). It is refused
+  1 Red, 2 Blue, 3 Green, 4 Purple; **0 when absent**, the one full dome, D212) and `stack` 1–10 spheres (1 when
+  absent). The coloured types show only where they meet terrain or a structure. It is refused
   **`dome-unavailable`**, with which piece is missing, unless ZoneDomes is loaded and the domes helper has
   patched it and seen ZoneDomes finish starting. A dome ZoneDomes does not make takes its zone with it:
   the zone is erased and the step refused.
@@ -2342,4 +2343,7 @@ several, or every server (D195, D210). The step's `options` field offers the pre
 preset edited later changes no published event. The step checks the line and the dome against the server's
 last hello when it is saved and in a dry run; `bad-option` and `dome-unavailable` are permanent refusals.
 
-**Not yet walked on a rig.** Written 2026-09-29, when the panel's file API on both rigs was down.
+**Compiled on both rigs and walked without a player, 2026-09-29** (PLAN_REDESIGNS §3.4): every refusal,
+ZoneManager and ZoneDomes reloads, a server restart and the forced opposite boot order (exactly one set of
+spheres each time), revert and expiry removing the dome, and a dome refused without the helper. The
+in-game rows (flags on a player, the messages) wait for the later in-game walk.