feat(llm): rename inference services dropping 'default' from names

frank-default-large -> frank-large (Dankclaw :7770), frank-default-small ->
frank-small (Dankserver :7770), frank-default-sightsound -> frank-npu
(Dankclaw :7771). Units, env files, serve scripts, deploy-plan mappings,
deploy-remote dispatch (stop/disable old units + relink + enable new), and the
test seams move together. Retired frank-default-npu.* artifacts moved to
scripts/.AGENTTRASH/ (tracked-in-history; ignored on disk).

Served aliases become frank-large / frank-small via --alias; the NPU endpoint
serves the whole FLM registry, so its rename changes no served tags.

tests/llm_units.bats

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # Seam: LLM systemd unit integrity.
-# Every LLM unit (frank-default-*.service) must point at files that exist in
+# Every LLM unit (frank-*.service) must point at files that exist in
 # this repo. The homepage-status unit is a different pattern (it installs to
 # /usr/local/bin and runs from /srv at deploy time) and is not checked here.
 # The units reference absolute paths on the target checkout
@@ -50,7 +50,7 @@ unit_repo_path() {
             echo "$bad"
             return 1
         fi
-    done < <(find "$REPO_ROOT/scripts" -name 'frank-default-*.service' -type f | sort)
+    done < <(find "$REPO_ROOT/scripts" -name "frank-*.service" -type f | grep -v AGENTTRASH | sort)
     [ "$any" -eq 1 ] || skip "no LLM units yet"
 }
 
@@ -65,7 +65,7 @@ unit_repo_path() {
             echo "unit $(basename "$unit") env file $envfile not in repo"
             return 1
         }
-    done < <(find "$REPO_ROOT/scripts" -name 'frank-default-*.service' -type f | sort)
+    done < <(find "$REPO_ROOT/scripts" -name "frank-*.service" -type f | grep -v AGENTTRASH | sort)
 }
 
 @test "LLM serve scripts exist for every unit" {
@@ -78,5 +78,5 @@ unit_repo_path() {
             echo "unit $svc: ExecStart script $script not in repo"
             return 1
         }
-    done < <(find "$REPO_ROOT/scripts" -name 'frank-default-*.service' -type f | sort)
+    done < <(find "$REPO_ROOT/scripts" -name "frank-*.service" -type f | grep -v AGENTTRASH | sort)
 }