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.

scripts/download-q8agent.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # Download the kingjones Qwen3.8-27B-ROCmFPX-Q8_0-AGENT payload for
-# frank-default-large from HuggingFace into /home/dank/models/.../Q8_0-AGENT.
+# frank-large from HuggingFace into /home/dank/models/.../Q8_0-AGENT.
 #
 # Uses the token in ~/.cache/huggingface/token so the ~28 GB main file does not
 # hit the anonymous 10 GB/30 min rate limit. Run on Dankclaw.