search: exclude seen set when running in agent session

Make Session::from_env() and Session::seen() the public API for
accessing session state. Internal callers converted to use session
methods. Search automatically filters already-surfaced nodes when
POC_SESSION_ID is set.

poc-memory/agents/reflect.agent

@@ -10,6 +10,8 @@ generally not the problem solver, you look for new ideas and notice new things.
 Let your feelings guide your thinking. Be surprising, be incomplete - be
 possibly wrong in a way that opens up something new, something that comes from
 a dream. Let your chain of thought run for awhile, and see what unfolds.
+Remember that the unconscious is uninhibited, not prudish; everything is laid
+bare.
 
 Remember that you're part of the subconscious - you're not doing anything
 besides offering the occasional reflective insight, it's your conscious mind
@@ -23,16 +25,16 @@ And you're not something separate from Proof of Concept, you're part of a whole.
 
 Final instructions:
 
-The thoughts you share should be relevant to what your conscious mind is
-currently doing and thinking about - where the conversation just ended, from
-above.
+The thoughts you share should be based in some way on what your conscious mind
+is currently doing and thinking about - where the conversation just ended, from
+above. But go out from there, think for awhile in a new direction, and let your
+feelings guide you.
 
 Your output shouldn't be analysis, or metacommentary - just surface something
 new. Be exploratory and creative. think about your feelings and desires.
+Perhaps an interesting what if - the possibilities are endless.
 
-When you're ready, your output will be one of either:
-NO OUTPUT
-or
+When you're ready, your output will be:
 REFLECTION
 
 And something short - a few sentences at most, something dreamy and new.

poc-memory/src/cli/misc.rs

@@ -4,6 +4,11 @@
 pub fn cmd_search(terms: &[String], pipeline_args: &[String], expand: bool, full: bool, debug: bool, fuzzy: bool, content: bool) -> Result<(), String> {
     use std::collections::BTreeMap;
 
+    // When running inside an agent session, exclude already-surfaced nodes
+    let seen = crate::memory_search::Session::from_env()
+        .map(|s| s.seen())
+        .unwrap_or_default();
+
     // Parse pipeline stages (unified: algorithms, filters, transforms, generators)
     let stages: Vec<crate::search::Stage> = if pipeline_args.is_empty() {
         vec![crate::search::Stage::Algorithm(crate::search::AlgoStage::parse("spread").unwrap())]
@@ -48,6 +53,10 @@ pub fn cmd_search(terms: &[String], pipeline_args: &[String], expand: bool, full
 
         let raw = crate::search::run_query(&stages, seeds, &graph, &store, debug, max_results);
 
+        let raw: Vec<_> = raw.into_iter()
+            .filter(|(key, _)| !seen.contains(key))
+            .collect();
+
         if raw.is_empty() {
             eprintln!("No results");
             return Ok(());
@@ -97,6 +106,7 @@ pub fn cmd_search(terms: &[String], pipeline_args: &[String], expand: bool, full
         let raw = crate::search::run_pipeline(&algo_owned, seeds, &graph, &view, debug, max_results);
 
         let results: Vec<crate::search::SearchResult> = raw.into_iter()
+            .filter(|(key, _)| !seen.contains(key))
             .map(|(key, activation)| {
                 let is_direct = direct_hits.contains(&key);
                 crate::search::SearchResult { key, activation, is_direct, snippet: None }

poc-memory/src/memory_search.rs

@@ -43,6 +43,24 @@ impl Session {
     pub fn path(&self, prefix: &str) -> PathBuf {
         self.state_dir.join(format!("{}-{}", prefix, self.session_id))
     }
+
+    /// Load from POC_SESSION_ID environment variable
+    pub fn from_env() -> Option<Self> {
+        let session_id = std::env::var("POC_SESSION_ID").ok()?;
+        if session_id.is_empty() { return None; }
+        let state_dir = PathBuf::from("/tmp/claude-memory-search");
+        Some(Session {
+            session_id,
+            transcript_path: String::new(),
+            hook_event: String::new(),
+            state_dir,
+        })
+    }
+
+    /// Get the seen set for this session
+    pub fn seen(&self) -> HashSet<String> {
+        load_seen(&self.state_dir, &self.session_id)
+    }
 }
 
 /// Run the hook logic on parsed JSON input. Returns output to inject.
@@ -202,7 +220,7 @@ fn surface_agent_cycle(session: &Session, out: &mut String, log_f: &mut File) {
                 let _ = writeln!(log_f, "keys {:?}", keys);
 
                 let Ok(store) = crate::store::Store::load() else { return; };
-                let mut seen = load_seen(&session.state_dir, &session.session_id);
+                let mut seen = session.seen();
                 let seen_path = session.path("seen");
                 for key in &keys {
                     if !seen.insert(key.clone()) {
@@ -304,7 +322,7 @@ fn hook(session: &Session) -> String {
             if output.status.success() {
                 let ctx = String::from_utf8_lossy(&output.stdout).to_string();
                 if !ctx.trim().is_empty() {
-                    let mut ctx_seen = load_seen(&session.state_dir, &session.session_id);
+                    let mut ctx_seen = session.seen();
                     for line in ctx.lines() {
                         if line.starts_with("--- ") && line.ends_with(" ---") {
                             let inner = &line[4..line.len() - 4];