agents: raise in-flight exclusion threshold from 0.15 to 0.3

The lower threshold excluded too many neighbors, causing "query
returned no results (after exclusion)" failures and underloading
the GPU. Now only moderately-connected neighbors (score > 0.3) are
excluded, balancing collision prevention with GPU utilization.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

poc-memory/src/agents/daemon.rs

@@ -142,7 +142,7 @@ fn job_consolidation_agent(
                 for (nbr, strength) in graph.neighbors(key) {
                     let weight = store.nodes.get(nbr.as_str())
                         .map(|n| n.weight).unwrap_or(0.1);
-                    if strength * weight > 0.15 {
+                    if strength * weight > 0.3 {
                         claimed_keys.push(nbr.clone());
                         locked.insert(nbr.clone());
                     }