journal: remove all stringly-typed key patterns, use NodeType

- journal_new: key is slugified title (agent names things properly)
- journal_tail: sort by created_at (immutable), not timestamp (mutable)
- journal_update: find latest by created_at
- {{latest_journal}}: query by NodeType::EpisodicSession, not "journal" key
- poc-memory journal write: requires a name argument
- Removed all journal#j-{timestamp}-{slug} patterns from:
  - prompts.rs (rename candidates)
  - graph.rs (date extraction, organize skip list)
  - cursor.rs (date extraction)
  - store/mod.rs (doc comment)
- graph.rs organize: filter by NodeType::Semantic instead of key prefix
- cursor.rs: use created_at for date extraction instead of key parsing

Co-Authored-By: Kent Overstreet <kent.overstreet@linux.dev>

src/cli/journal.rs

@@ -1,7 +1,7 @@
 // cli/journal.rs — journal subcommand handlers
 
 
-pub fn cmd_tail(n: usize, full: bool, provenance: Option<&str>) -> Result<(), String> {
+pub fn cmd_tail(n: usize, full: bool, provenance: Option<&str>, dedup: bool) -> Result<(), String> {
     let path = crate::store::nodes_path();
     if !path.exists() {
         return Err("No node log found".into());
@@ -24,11 +24,21 @@ pub fn cmd_tail(n: usize, full: bool, provenance: Option<&str>) -> Result<(), St
         }
     }
 
-    // Filter by provenance if specified (prefix match)
+    // Filter by provenance if specified (substring match)
     if let Some(prov) = provenance {
         entries.retain(|n| n.provenance.contains(prov));
     }
 
+    // Dedup: keep only the latest version of each key
+    if dedup {
+        let mut seen = std::collections::HashSet::new();
+        // Walk backwards so we keep the latest
+        entries = entries.into_iter().rev()
+            .filter(|n| seen.insert(n.key.clone()))
+            .collect();
+        entries.reverse();
+    }
+
     let start = entries.len().saturating_sub(n);
     for node in &entries[start..] {
         let ts = if node.timestamp > 0 && node.timestamp < 4_000_000_000 {
@@ -172,27 +182,23 @@ pub fn cmd_journal_tail(n: usize, full: bool, level: u8) -> Result<(), String> {
     }
 }
 
-pub fn cmd_journal_write(text: &[String]) -> Result<(), String> {
+pub fn cmd_journal_write(name: &str, text: &[String]) -> Result<(), String> {
     if text.is_empty() {
-        return Err("journal-write requires text".into());
+        return Err("journal write requires text".into());
     }
     super::check_dry_run();
     let text = text.join(" ");
 
     let timestamp = crate::store::format_datetime(crate::store::now_epoch());
+    let content = format!("## {} — {}\n\n{}", timestamp, name, text);
 
-    let slug: String = text.split_whitespace()
-        .take(6)
+    let key: String = name.split_whitespace()
         .map(|w| w.to_lowercase()
             .chars().filter(|c| c.is_alphanumeric() || *c == '-')
             .collect::<String>())
+        .filter(|s| !s.is_empty())
         .collect::<Vec<_>>()
         .join("-");
-    let slug = if slug.len() > 50 { &slug[..50] } else { &slug };
-
-    let key = format!("journal#j-{}-{}", timestamp.to_lowercase().replace(':', "-"), slug);
-
-    let content = format!("## {}\n\n{}", timestamp, text);
 
     let source_ref = find_current_transcript();