timestamp sanitization, CoT logging, reasoning field fix, persistent queue

- store/types.rs: sanitize timestamps on capnp load — old records had
  raw offsets instead of unix epoch, breaking sort-by-timestamp queries
- agents/api.rs: drain reasoning tokens from UI channel into LLM logs
  so we can see Qwen's chain-of-thought in agent output
- agents/daemon.rs: persistent task queue (pending-tasks.jsonl) —
  tasks survive daemon restarts. Push before spawn, remove on completion,
  recover on startup.
- api/openai.rs: only send reasoning field when explicitly configured,
  not on every request (fixes vllm warning)
- api/mod.rs: add 600s total request timeout as backstop for hung
  connections
- Cargo.toml: enable tokio-console feature for task introspection

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

poc-memory/src/store/types.rs

@@ -357,6 +357,15 @@ impl Node {
                 node.provenance = Provenance::from_capnp(old).label().to_string();
             }
         }
+        // Sanitize timestamps: old capnp records have raw offsets instead
+        // of unix epoch. Anything past year 2100 (~4102444800) is bogus.
+        const MAX_SANE_EPOCH: i64 = 4_102_444_800;
+        if node.timestamp > MAX_SANE_EPOCH || node.timestamp < 0 {
+            node.timestamp = node.created_at;
+        }
+        if node.created_at > MAX_SANE_EPOCH || node.created_at < 0 {
+            node.created_at = node.timestamp.min(MAX_SANE_EPOCH);
+        }
         Ok(node)
     }
 }