Research 018 graduates: ADRs 0173–0177 and to-be 37, the operator's machine

Every configurable thing on a node is a module, the home included, and a
module is whatever it declares (0173, extending 0040). A node varies a module
only through a setting rendered into the file or a kept region, never an edit
(0174, extending 0011; issue 168 first). One tool runtime per node serves every
module's tools on the host side, never in a container; the console is its
serving mode, renamed node-tools (0175, extending 0150; 0047/0150/0152 carry
dated notes). The login shell is a node seat held by one shell module with
`execute` as its contract (0176). A unit may be user-scoped and the service
manager is a node seat held by systemd (0177).

To-be 37 is handed off in-progress to mesh-host, mesh-controller, mesh-tools
and mesh-catalog, with the build in order: the account on every node, the
runtime, zsh, systemd, then the graphical stack. To-be 29 keeps ~/.ssh and
points at 37; 33 §6 and 34 are amended; the glossary gains node tools, bundle,
kept region, installed/holding, and retires flavor.

00-META/glossary.md

@@ -95,3 +95,21 @@ another — and a mesh you cannot name precisely is a mesh two people describe d
 A new name for an existing thing lands here first, in the same change that introduces it in code. A
 record under `02-DECISIONS/` keeps whatever word it was written with — those are immutable — so a
 term retired here may still appear there, and the mapping above is how to read it.
+
+## The operator's machine
+
+- **node tools** — the one tool runtime per node, a host-side process the host supervises, that loads
+  every assigned module's tools bundle and serves every tool and held seat's verb on the subjects the
+  memberships issue; its serving mode on loopback is what was called **the console**
+  ([ADR 0175](../02-DECISIONS/0175-one-tool-runtime-per-node-serves-every-modules-tools-on-the-host-side.md)).
+  Replaces **"console"** as the module's name; *console* remains the word for the person's end of it.
+- **bundle** — the artifact a module's tools are built into, interpreted or compiled; never an image.
+- **kept region** — a marked block in a managed file the mesh writes *into*, where the operator's own
+  lines survive every push and are given back when the module goes
+  ([ADR 0174](../02-DECISIONS/0174-a-node-varies-a-module-through-settings-and-kept-regions-never-an-edit.md)).
+  One of the two ways a node varies a module; the other is a **setting**.
+- **installed / holding** — a module may be assigned (its package installed, its files placed) without
+  holding the seat its family declares; *holding* is being the one — the login shell, the display
+  session — on that node ([ADR 0176](../02-DECISIONS/0176-the-login-shell-is-a-node-seat-and-execute-is-its-contract.md)).
+- ~~flavor~~ — not used. What a flavor varied is a setting or a separate module.
+