Design 51: keep the node-engine's own build readable by away nodes (ADR 0623)

Under ADR 0618 alone a node away with an old node-engine would be held
from the node-engine's own build in the new form and could never update
itself. ADR 0623 keeps every counted node-engine's form in those builds
and moves them to a node that reads any one of them.

Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig

03-DESIGN/01-to-be/51-the-registries-keep-what-is-named.md

@@ -19,6 +19,7 @@ decisions:
   - "ADR 0613"
   - "ADR 0617"
   - "ADR 0618"
+  - "ADR 0623"
   - "ADR 0606"
   - "ADR 0607"
   - "ADR 0610"
@@ -379,25 +380,30 @@ publish of mesh-sdk or `mesh-contracts` triggers their users (ADR 0614 §6). The
 build and adds none (ADR 0613 §1). ADR 0614 bounds nothing here; a bound, such as a settle before building a
 fingerprint whose inputs still move, is a question for a record, put to the operator, and is not designed here.
 
-**The node-engine's own build keeps the old reference form** until every present node-engine states the capability
+**The node-engine's own build keeps the old reference form** while any node-engine the mesh counts states only it,
-to read the new one (ADR 0618 §2): the builder writes a new reference form, in the node-engine's done key as in every
+away ones included (ADR 0623 §1-2). For the module that holds the seat `node-engine`, the builder writes into each
-other build's, only once every node-engine on a node present states it, so no build, the node-engine's own included,
+build key every reference form a counted node-engine states, beside the new form, which it writes there as in every
-needs a form no running node-engine reads (ADR 0603 §7, §9). Each build names with it the reader capabilities its
+other build only once every present node-engine states it (ADR 0618 §2); a node leaves the count only when it is
-forms need, and the assigner holds a node's want while that node's engine does not state one (ADR 0618 §1), so a node
+retired, never because it is away (ADR 0623 §1). The assigner moves the node-engine's own build to a node once that
-that was away is held, never handed a form it cannot read. This is a window like the old seat name's. The builder
+node's engine states any one form the build carries (ADR 0623 §2), so a node back from being away moves to the new
-reads each node's stated capabilities through the node-engine seat's verb `manifest-reads` (ADR 0618 §3) at its start,
+node-engine through the old form, states the new capabilities from then on, and can always update itself (ADR 0603
-and wakes on the seat's event `mesh.seat.node-engine.event.manifest-reads-changed`, said when a node's stated
+§7, §9). Every other module's builds keep ADR 0618 §1-2: they carry the new form once every present node-engine
-capabilities change and when the node returns after being away (ADR 0618 §4), never on a watch of the node-engine's
+states it, each names the reader capabilities its forms need, and the assigner holds a node's want while that node's
-have state (ADR 0596) and never on a timer. The builder declares `seat:node-engine.manifest-reads` in its `invokes`:
+engine does not state one, so a node that was away is held from them, never handed a form it cannot read, until its
-that is the grant the grants part composes, and with it the grants part grants the builder the subscription to the
+new node-engine states the form. The old form in the node-engine's own builds is a window like the old seat name's:
-event's subject. A node-engine that does not yet serve `manifest-reads` counts as stating nothing: the window stays
+it closes when no counted node-engine states the old form alone, and the builder then drops it from those builds. The
-open and names the node. Only a present node-engine that has not updated holds this window; a node away is held by the
+builder reads each node's stated capabilities through the node-engine seat's verb `manifest-reads` (ADR 0618 §3) at
-assigner instead and is not listed as holding it. Its tool `builder_old_form` lists whether the window is open and the
+its start, and wakes on the seat's event `mesh.seat.node-engine.event.manifest-reads-changed`, said when a node's
-present nodes whose node-engine does not yet state the capability, and drops a retired node from it by hand, recorded
+stated capabilities change and when the node returns after being away (ADR 0618 §4), never on a watch of the
-as a hand act; a present node holding it open for seven days is the builder's finding naming the node, cleared when
+node-engine's have state (ADR 0596) and never on a timer. The builder declares `seat:node-engine.manifest-reads` in
-the window closes. Closing it says so in the build log and emits `old-form-closed` (the time, the nodes that held
+its `invokes`: that is the grant the grants part composes, and with it the grants part grants the builder the
-it last, the nodes dropped by hand) on the builder's own family beside `numbered`; a waiter on a build's end does not
+subscription to the event's subject. A node-engine that does not yet serve `manifest-reads` counts as stating
-wake on it.
+nothing: the window stays open and names the node. Its tool `builder_old_form` lists whether the window is open and
+the counted nodes, present or away, whose node-engine states only the old form, and drops a retired node from the
+count by hand, recorded as a hand act; a node holding it open for seven days is the builder's finding naming the node,
+cleared when the window closes. Closing it says so in the build log and emits `old-form-closed` (the time, the nodes
+that held it last, the nodes dropped by hand) on the builder's own family beside `numbered`; a waiter on a build's end
+does not wake on it.
 
 **When the group is pushed.** Only once the release that adds the node-engine's stated capability (design 47) runs on
 every node, read from the status view's haves before the push, and once the progressive insights of ADR 0595 and
@@ -487,14 +493,15 @@ test).
   source other than the publish target) the floor finding is written and cleared once it answers, and with
   `bridge_tags` still silent after the by-digest publish, the build stays unnumbered until the forge bridge's health
   clears (no timer runs), and is then numbered and published by version; `builder_floor_again` asks the three
-  sources at once and records the hand act; the node-engine's done key stays in the old form while one present node's
+  sources at once and records the hand act; a build key carries only the old form while one present node's
-  node-engine lacks the capability, or does not serve `manifest-reads`, and is written in the new form once every
+  node-engine lacks the capability, or does not serve `manifest-reads`, and carries the new form once every present
-  present node states it, `builder_old_form` naming that node meanwhile and dropping it by hand with a hand act; with
+  node states it (ADR 0618 §2); with one node away whose node-engine lacks the capability, the node-engine's own build
-  one node away whose node-engine lacks the capability, the new form is written, the assigner holds that node's want,
+  still carries the old form beside the new and is moved to that node, while another module's build in the new form
-  and `builder_old_form` does not list it (ADR 0618 §1, §2); a present node gaining the capability closes
+  is held by the assigner for it (ADR 0623 §1-2, ADR 0618 §1), `builder_old_form` naming that node meanwhile and
-  that window on its `manifest-reads-changed` event with no `delivered` and no timer (ADR 0618 §2, §4), while a node
+  dropping a retired one from the count by hand with a hand act; that node, back with the new node-engine, says
-  away is held by the assigner from builds in the new form (ADR 0618 §1), with `old-form-closed` emitted
+  `manifest-reads-changed` and the window closes with no `delivered` and no timer (ADR 0618 §4), the old form dropped
-  and its build-log line written, and a waiter on a build's end does not wake on it; with the image's own seat silent
+  from the node-engine's own builds, with `old-form-closed` emitted and its build-log line written, and a waiter on a
+  build's end does not wake on it; with the image's own seat silent
   at the claim of `distribution`'s own image, the image is still built, published by its digest, and numbered once
   its new build answers (ADR 0617 *How it is checked*).
 - **Builder, added for the milestone, unit** (cases of the builder's numbering): a second trunk build of a package's