feat(serve): add recurring pattern detection endpoint (GH-318)

crates/edda-ledger/src/ledger.rs

@@ -239,6 +239,17 @@ impl Ledger {
         self.sqlite.village_stats(village_id, after, before)
     }
 
+    /// Detect recurring patterns in a village's decision history.
+    pub fn detect_village_patterns(
+        &self,
+        village_id: &str,
+        after: &str,
+        min_occurrences: usize,
+    ) -> anyhow::Result<Vec<crate::sqlite_store::DetectedPattern>> {
+        self.sqlite
+            .detect_village_patterns(village_id, after, min_occurrences)
+    }
+
     /// Find the active decision for a specific key on a branch.
     pub fn find_active_decision(
         &self,

crates/edda-ledger/src/lib.rs

@@ -19,8 +19,8 @@ pub use ledger::Ledger;
 pub use lock::WorkspaceLock;
 pub use paths::EddaPaths;
 pub use sqlite_store::{
-    BundleRow, ChainEntry, DecideSnapshotRow, DecisionRow, DepRow, DeviceTokenRow, ImportParams,
-    SuggestionRow, TaskBriefRow,
+    BundleRow, ChainEntry, DecideSnapshotRow, DecisionRow, DepRow, DetectedPattern, DeviceTokenRow,
+    ImportParams, PatternDetectionResult, PatternType, SuggestionRow, TaskBriefRow,
 };
 pub use tombstone::{append_tombstone, list_tombstones, make_tombstone, DeleteReason, Tombstone};
 pub use view::DecisionView;