feat(core): Expand filtering into pipeline supporting multiple text search modes.

Modes include: exact match, smart-case, and regular expressions.

crates/pikl-core/src/runtime/json_menu.rs

@@ -1,25 +1,27 @@
 //! JSON-backed menu implementation. Wraps `Vec<Item>` with
-//! fuzzy filtering via nucleo. This is the default backend
+//! pipeline filtering. This is the default backend
 //! for `ls | pikl` style usage.
 
-use crate::filter::{Filter, FuzzyFilter};
+use crate::filter::Filter;
 use crate::item::Item;
 use crate::model::traits::Menu;
+use crate::pipeline::FilterPipeline;
 
 /// A menu backed by a flat list of JSON items. Handles
-/// filtering internally using the [`Filter`] trait (fuzzy
-/// by default). The `label_key` controls which JSON key
-/// is used for display labels on object items.
+/// filtering internally using the [`FilterPipeline`] which
+/// supports fuzzy, exact, regex, and `|`-chained queries.
+/// The `label_key` controls which JSON key is used for
+/// display labels on object items.
 pub struct JsonMenu {
     items: Vec<Item>,
     label_key: String,
-    filter: Box<dyn Filter>,
+    filter: FilterPipeline,
 }
 
 impl JsonMenu {
     /// Create a new JSON menu with the given items and label key.
     pub fn new(items: Vec<Item>, label_key: String) -> Self {
-        let mut filter = Box::new(FuzzyFilter::new());
+        let mut filter = FilterPipeline::new();
         for (i, item) in items.iter().enumerate() {
             filter.push(i, item.label());
         }