docs: add dotfiles vocabulary

docs/dictionary.md

@@ -32,3 +32,15 @@ Use `REPLACE` for terms that have a preferred substitute.
 | `really` | AVOID |  | Empty intensifier. |
 | `furthermore` / `moreover` | REPLACE | `also`, `and` | Overly formal transitional filler. |
 | repository root | USE |  | The Git work tree root. Use it to resolve repository-relative paths. |
+| agent | USE |  | An AI coding assistant acting in the operator's environment. |
+| operator | USE |  | The human driving the development process. Use when distinguishing the human from the agent acting on their behalf. |
+| guest | USE |  | A systemd-nspawn container managed by the NixOS configuration. |
+| host | USE |  | A machine with a NixOS configuration built by this repository's flake. |
+| module | USE |  | A self-contained NixOS configuration under `configs/nixos/modules/`. |
+| registry | USE |  | A typed configuration namespace whose entries can be collected across hosts and reused by other configuration. |
+| Conventional Commits | USE |  | A commit-message format defined in `docs/conventional-commits.md`. |
+| forge | USE |  | A web service that hosts Git repositories, pull requests, issues, and code review comments. Use when the exact provider does not matter. |
+| flake | USE |  | A Nix project with pinned inputs and declared outputs. Use for the repository-level build unit defined by `flake.nix`. |
+| NixOS module | USE |  | A Nix file evaluated by `nixosSystem` for a NixOS configuration. |
+| overlay | USE |  | A function that modifies a Nix package set by adding or replacing packages. |
+| workspace | USE |  | A named or numbered group of windows in a graphical session. Some desktop environments call this a virtual desktop. |