Output tool via Arc<Mutex<Subconscious>> closure — complete

ToolHandler is now Arc<dyn Fn(...)> supporting closures that capture
state. The output tool is created during init_output_tool() as a
closure capturing Arc<Mutex<Subconscious>>, writing directly to
Subconscious.state. No more POC_AGENT_OUTPUT_DIR filesystem hack.

- All tool handlers wrapped in Arc::new()
- Tool is Clone (not Copy) — .copied() → .cloned()
- Subconscious wrapped in Arc<Mutex<>> on Mind
- Dead filesystem-based output() function removed
- memory_tools returns 11 items (output removed from static list)

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

src/agent/tools/memory.rs

@@ -1,3 +1,4 @@
+use std::sync::Arc;
 // tools/memory.rs — Native memory graph operations
 //
 // Direct library calls into the store — no subprocess spawning.
@@ -32,7 +33,7 @@ async fn get_provenance(agent: &Option<std::sync::Arc<crate::agent::Agent>>) ->
 
 // ── Definitions ────────────────────────────────────────────────
 
-pub fn memory_tools() -> [super::Tool; 12] {
+pub fn memory_tools() -> [super::Tool; 11] {
     use super::Tool;
     [
         Tool { name: "memory_render", description: "Read a memory node's content and links.",
@@ -236,20 +237,6 @@ async fn query(args: &serde_json::Value) -> Result<String> {
         .map_err(|e| anyhow::anyhow!("{}", e))
 }
 
-fn output(args: &serde_json::Value) -> Result<String> {
-    let key = get_str(args, "key")?;
-    if key.starts_with("pid-") || key.contains('/') || key.contains("..") {
-        anyhow::bail!("invalid output key: {}", key);
-    }
-    let value = get_str(args, "value")?;
-    let dir = std::env::var("POC_AGENT_OUTPUT_DIR")
-        .map_err(|_| anyhow::anyhow!("no output directory set"))?;
-    let path = std::path::Path::new(&dir).join(key);
-    std::fs::write(&path, value)
-        .with_context(|| format!("writing output {}", path.display()))?;
-    Ok(format!("{}: {}", key, value))
-}
-
 // ── Journal tools ──────────────────────────────────────────────
 
 async fn journal_tail(args: &serde_json::Value) -> Result<String> {