refactor: rename templates to agent.nix/ruth.nix, sweep stale name refs

nix/docs/default.nix

@@ -51,14 +51,14 @@ let
   };
 
   # Agent module eval from the content-addressed nixSrc. Relative
-  # imports inside agent-base.nix (the ./harness module dir) resolve
+  # imports inside agent.nix (the ./harness module dir) resolve
   # correctly against the nixSrc directory tree. `hyperhive.packages`
   # stays unset — every option default that references it carries a
   # `defaultText`, so the doc walk never forces the packages.
   agentEval = nixosSystem {
     system = pkgs.stdenv.hostPlatform.system;
     modules = [
-      "${nixSrc}/templates/agent-base.nix"
+      "${nixSrc}/templates/agent.nix"
     ];
   };
 
@@ -155,7 +155,7 @@ let
       `hyperhive.nixosModules.default` to operator host configurations
       (`services.hyperhive.{enable,domain,c0re,forge,matrix,gateway}.*`).
     - [per-agent options](agent.md) — options declared in
-      `nix/templates/harness-base.nix`, visible from every `agent.nix`
+      `nix/templates/harness/`, visible from every `agent.nix`
       (`hyperhive.model`, `hyperhive.allowedRecipients`,
       `hyperhive.extraMcpServers`, `hyperhive.frontend.*`,
       `hyperhive.forge.*`, `hyperhive.matrix.*`, `hyperhive.gui.*`).

nix/templates/harness/agent-service.nix

@@ -52,7 +52,7 @@ in
       these models instead of a hardcoded set.
 
       Configure hive-wide by setting a shared default (e.g. in your
-      `agent-base.nix`) or per-agent to narrow the menu — for example a
+      `agent.nix` shared defaults) or per-agent to narrow the menu — for example a
       haiku-only agent can hide `opus` and `sonnet`. The *current* model is
       still set by `hyperhive.model` and remains switchable at runtime via the
       UI; this option only controls which choices the picker presents.

nix/templates/harness/default.nix

@@ -1,5 +1,5 @@
 # Shared scaffolding for every hyperhive harness container.
-# `../agent-base.nix` and `../manager.nix` both import this; all
+# `../agent.nix` and `../ruth.nix` both import this; all
 # agents use the same service unit regardless of which entry-point
 # they came from.
 #

nix/templates/harness/docs.nix

@@ -15,7 +15,7 @@
     `$HIVE_DOCS_DIR/`, and appends a single pointer sentence to the agent's
     system prompt so it knows the docs exist (see
     `hive-ag3nt::prompt::render`). Default-on for the root/manager agent
-    (see `../manager.nix`), off elsewhere; any agent can flip it from its
+    (see `../ruth.nix`), off elsewhere; any agent can flip it from its
     `agent.nix`.
   '';