add nocmem: auto memory recall + ingest via NuoNuo hippocampal network

- nocmem Python service (mem/): FastAPI wrapper around NuoNuo's
  Hopfield-Hebbian memory, with /recall, /ingest, /store, /stats endpoints
- NOC integration: auto recall after user message (injected as system msg),
  async ingest after LLM response (fire-and-forget)
- Recall: cosine pre-filter (threshold 0.35) + Hopfield attention (β=32),
  top_k=3, KV-cache friendly (appended after user msg, not in system prompt)
- Ingest: LLM extraction + paraphrase augmentation, heuristic fallback
- Wired into main.rs, life.rs (agent done), http.rs (api chat)
- Config: optional `nocmem.endpoint` in config.yaml
- Includes benchmarks: LongMemEval (R@5=94.0%), efficiency, noise vs scale
- Design doc: doc/nocmem.md

src/config.rs

@@ -13,6 +13,13 @@ pub struct Config {
     pub whisper_url: Option<String>,
     #[serde(default)]
     pub gitea: Option<GiteaConfig>,
+    #[serde(default)]
+    pub nocmem: Option<NocmemConfig>,
+}
+
+#[derive(Deserialize, Clone)]
+pub struct NocmemConfig {
+    pub endpoint: String,
 }
 
 #[derive(Deserialize, Clone)]