v0.18.0:1 - scrub owner-specific hostnames, ips, usernames, names from tracked files

Replace real cluster IPs/hosts/usernames and example names with neutral
placeholders across docs, ops notes, package install text, and the offline
redaction test; delete the obsolete build-time starter prompt. Closes the
portability audit's single blocker. No runtime behavior change.

known-issues.md

@@ -17,7 +17,7 @@ The old chunking/retry workaround in `audio_proxy.py` and the Magpie sections in
 **Fix:**
 
 ```bash
-ssh modelo@<spark-2-host> 'docker run --rm -v magpie-model-cache:/cache alpine chown -R 1000:1000 /cache && docker restart magpie-tts'
+ssh <spark-user>@<spark-2-host> 'docker run --rm -v magpie-model-cache:/cache alpine chown -R 1000:1000 /cache && docker restart magpie-tts'
 ```
 
 The trick is the `docker run --rm alpine chown` — it runs as root inside the throwaway container, which is enough to chown the bind-mounted volume on the host, without needing `sudo` on the host itself. After the chown + restart, magpie downloaded its ~3 GB model from NGC into the cache and came up healthy on `:9000`.
@@ -38,7 +38,7 @@ After the eugr/spark-vllm-docker update, vLLM became stricter about multimodal t
 
 ## Two SSH paths to Spark 1 from the laptop
 
-`ssh modelo@192.168.1.103` does NOT work from the laptop because the NVIDIA Sync ssh_config only has a Host entry for `spark-27ea.local`. Always use the `.local` hostname or `192.168.1.87`-style entries that ARE matched.
+`ssh <spark-user>@<spark-1-ip>` does NOT work from the laptop because the NVIDIA Sync ssh_config only has a Host entry for the Spark's `.local` mDNS name, not its bare IP. Always SSH via the `<spark-1-host>.local` hostname (or another entry that the ssh_config actually matches) rather than the raw IP.
 
 ## Older models in `models.yaml`