release(slice3): v0.49.0 — faceted left-pane filtering (§22.4a SLICE-3)

SPEC.md

@@ -897,7 +897,13 @@ a hierarchy on the user that gets in the way of finding by title.
 - **Filter chip strip** — multi-select, AND-combined. Chips:
   `State: super-draft | active | withdrawn`, `My RFCs` (I'm an owner
   or arbiter), `Has open PRs`, `Unclaimed` (super-drafts with empty
-  `owners:`), `Tag: …`.
+  `owners:`), `Tag: …`. A collection that declares a metadata field
+  schema (§22.4a) replaces this chip strip with **faceted filter
+  groups** — one collapsible group per `enum`/`tags` field plus state,
+  each showing per-value result counts and multi-select checkboxes
+  (OR within a field, AND across fields); see the Configurable
+  Collection Metadata design. A collection with no `fields:` schema
+  keeps the chip strip described here unchanged.
 
 ### 7.2 The list rows