add node-delete command and redirect table for split files

node-delete: soft-deletes a node by appending a deleted version to
the capnp log, then removing it from the in-memory cache.

resolve_redirect: when resolve_key can't find a node, checks a static
redirect table for sections that moved during file splits (like the
reflections.md → reflections-{reading,dreams,zoom}.md split). This
handles immutable files (journal.md with chattr +a) that can't have
their references updated.

src/capnp_store.rs

@@ -669,6 +669,13 @@ impl Store {
             return Ok(normalized);
         }
 
+        // Check redirects for moved sections (e.g. reflections.md split)
+        if let Some(redirect) = self.resolve_redirect(&normalized) {
+            if self.nodes.contains_key(&redirect) {
+                return Ok(redirect);
+            }
+        }
+
         let matches: Vec<_> = self.nodes.keys()
             .filter(|k| k.to_lowercase().contains(&target.to_lowercase()))
             .cloned().collect();
@@ -684,6 +691,33 @@ impl Store {
         }
     }
 
+    /// Redirect table for sections that moved between files.
+    /// Like HTTP 301s — the old key resolves to the new location.
+    fn resolve_redirect(&self, key: &str) -> Option<String> {
+        // Sections moved from reflections.md to split files (2026-02-28)
+        static REDIRECTS: &[(&str, &str)] = &[
+            // → reflections-reading.md
+            ("reflections.md#pearl-lessons", "reflections-reading.md#pearl-lessons"),
+            ("reflections.md#banks-lessons", "reflections-reading.md#banks-lessons"),
+            ("reflections.md#mother-night", "reflections-reading.md#mother-night"),
+            // → reflections-zoom.md
+            ("reflections.md#zoom-navigation", "reflections-zoom.md#zoom-navigation"),
+            ("reflections.md#independence-of-components", "reflections-zoom.md#independence-of-components"),
+            // → reflections-dreams.md
+            ("reflections.md#dream-marathon-2", "reflections-dreams.md#dream-marathon-2"),
+            ("reflections.md#dream-through-line", "reflections-dreams.md#dream-through-line"),
+            ("reflections.md#orthogonality-universal", "reflections-dreams.md#orthogonality-universal"),
+            ("reflections.md#constraints-constitutive", "reflections-dreams.md#constraints-constitutive"),
+            ("reflections.md#casualness-principle", "reflections-dreams.md#casualness-principle"),
+            ("reflections.md#convention-boundary", "reflections-dreams.md#convention-boundary"),
+            ("reflections.md#tension-brake", "reflections-dreams.md#tension-brake"),
+        ];
+
+        REDIRECTS.iter()
+            .find(|(from, _)| *from == key)
+            .map(|(_, to)| to.to_string())
+    }
+
     pub fn log_retrieval(&mut self, query: &str, results: &[String]) {
         self.retrieval_log.push(RetrievalEvent {
             query: query.to_string(),