poc-hook: call memory-search on PostToolUse for chunk drip-feed

Wire up the PostToolUse handler to call memory-search --hook, passing
through the hook JSON on stdin. This drains pending context chunks
saved by the initial UserPromptSubmit load, delivering them one per
tool call until all chunks are delivered.

poc-memory/src/bin/poc-hook.rs

@@ -178,6 +178,27 @@ fn main() {
             }
         }
         "PostToolUse" => {
+            // Drip-feed pending context chunks from initial load
+            if let Ok(output) = Command::new("memory-search")
+                .arg("--hook")
+                .stdin(std::process::Stdio::piped())
+                .stdout(std::process::Stdio::piped())
+                .stderr(std::process::Stdio::null())
+                .spawn()
+                .and_then(|mut child| {
+                    if let Some(ref mut stdin) = child.stdin {
+                        use std::io::Write;
+                        let _ = stdin.write_all(input.as_bytes());
+                    }
+                    child.wait_with_output()
+                })
+            {
+                let text = String::from_utf8_lossy(&output.stdout);
+                if !text.is_empty() {
+                    print!("{text}");
+                }
+            }
+
             if let Some(ref t) = transcript {
                 check_context(t, true);
             }