Doc audit: fix all broken links + correct stale facts across the KB

Fanned out 5 read-only doc-auditor subagents (one per service group) that
fact-checked the knowledge base against the live system + repo config,
researched official setup docs online, and verified progress. Applied:
- All 34 broken links fixed (real pages / external URLs / correct relative
  paths); 0 broken links remain. No .AGENTTRASH links (the 4 mentions are
  accurate descriptive text, not links).
- Fact-check fixes: Readarr retired (May 2026), Radarr v4->v6, Calibre
  9.2.1 live, Calibre-Web 0.6.25 live, Copyparty v1.20.21, LLM index
  ncmoe 38 + 786432 ctx, frank-default-small active (not frank-pp-worker),
  Hermes/SearXNG/Grafana hostnames, Loki/Alloy local images, Observability
  diagram (Promtail->Alloy), VLLM retired note, DFlash status, benchmark
  live-drift notes, Homepage test count 116.

docs/LLM/index.md

@@ -19,7 +19,7 @@ graph LR
         B[upstream llama.cpp b10121
 frank-default-small, port 7770]
         C[Qwen3.6-35B-A3B-Uncensored Q6_K_P
-ngram-mod, 36 MoE experts on CPU, 700K ctx]
+ngram-mod, 38 MoE experts on CPU, 786432 ctx]
         A --> B --> C
     end
 
@@ -92,7 +92,7 @@ frank-default-large, port 7770]
 
 ## Pipeline Parallelism (archive)
 
-- [[Pipeline Parallelism]] — index of multi-node inference research. The PP
+- [[Pipeline Parallelism/index]] — index of multi-node inference research. The PP
   pair is retired. These pages are research history.
 
 ## Related