diff --git a/CHANGELOG.md b/CHANGELOG.md
index aad5367..417be35 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,51 @@ skip versions are the composition of each intervening adjacent
 release's steps in order — no A-to-B path is pre-computed beyond
 that.
 
+## 0.50.0 — 2026-06-07
+
+**Minor — single-entry metadata edit + sidecar-aware writes (§22.4a SLICE-4).**
+An authorized user can now edit one entry's schema-defined metadata directly from
+its detail view. A new endpoint
+`POST /api/projects/{id}/collections/{cid}/rfcs/{slug}/meta` takes `{values:{…}}`,
+validates them against the collection's `fields:` schema at the write boundary
+(INV-4), writes them to the entry's `<slug>.meta.yaml` **sidecar** with a **direct
+commit** (D7 — no PR for authorized roles), and re-ingests. A legacy entry is
+**lazy-migrated** to a clean body-only `.md` + sidecar on its first metadata edit.
+The detail view renders one control per declared field (enum→select, tags→chips,
+text→input), read-only without contribute access; `GET` on an entry now returns
+its `meta` mapping and a `can_edit_meta` capability. This completes PUC-1 of the
+[Configurable Collection Metadata](./docs/design/2026-06-06-configurable-collection-metadata.md)
+design (§7.2); bulk edit (SLICE-5) follows.
+
+Carried from SLICE-1: **every entry write path is now sidecar-aware.** Graduation,
+ownership claim, retire/un-retire, mark-reviewed, the body-edit accept/flush
+wrappers, and the PR-replay wrappers all dual-read an entry (so a migrated
+body-only `.md` no longer crashes `entry.parse`) and write metadata changes to the
+sidecar, keeping the `.md` body pure (INV-2) and never re-growing frontmatter; a
+legacy entry lazy-migrates on its first metadata-bearing write. With the write
+paths safe, the **Owner-gated collection-migration endpoint**
+`POST /api/projects/{id}/collections/{cid}/migrate` now ships (PUC-5): it converts
+a collection's legacy-frontmatter entries to clean body-only `.md` + sidecars in
+one commit, idempotently.
+
+Non-breaking and opt-in (INV-5): a collection with **no `fields:`** exposes no
+edit panel and the edit endpoint returns 422 ("no editable fields"); the §22.13
+default `document` collection declares none — so **N=1 deployments see no change**.
+
+**Upgrade steps**
+
+- No schema migration. The edit and migrate endpoints are additive; the sidecar
+  storage layer (mig 033) and `meta_json` index (mig 034) shipped in 0.47.0/0.49.0.
+- A deployment adopts single-entry editing by declaring an `enum`/`tags`/`text`
+  `fields:` block in a collection's `.collection.yaml` (SLICE-2). Contributors+
+  on that collection (§22 Part B / S3 scope roles) may then edit from the detail
+  view; the change is a direct commit to the entry's sidecar.
+- Operators MAY run `POST …/collections/{cid}/migrate` (collection Owner only) to
+  convert a collection's existing entries to clean body-only docs + sidecars up
+  front. It is idempotent and safe to re-run; dual-read means an un-migrated
+  collection keeps working, and entries lazy-migrate on their first metadata edit
+  regardless. **No data migration is required.**
+
 ## 0.49.0 — 2026-06-07
 
 **Minor — faceted left-pane filtering (§22.4a SLICE-3).** A collection that
diff --git a/SPEC.md b/SPEC.md
index b437464..7d145aa 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -5152,6 +5152,16 @@ never used for routing or lookup. New entries are never assigned one.
 > across collections. What `type` still selects is the **terminology** (item 2,
 > the entry noun, shipped v0.45.0) and the **default `initial_state` / review
 > posture** (§22.4b–c).
+>
+> **Shipped status.** The design lands incrementally: sidecar storage +
+> dual-read (SLICE-1, v0.47.0), the collection `fields:` schema + central
+> validation (SLICE-2, v0.48.0), faceted left-pane filtering (SLICE-3, v0.49.0),
+> and **single-entry metadata edit (SLICE-4, v0.50.0)** — the direct-commit
+> `POST …/rfcs/{slug}/meta` editor (contributor+, validated at the write
+> boundary), the schema-driven detail panel, all entry **write paths made
+> sidecar-aware** (a migrated body-only `.md` never re-grows frontmatter), and
+> the Owner-gated `POST …/collections/{cid}/migrate` endpoint. Bulk edit
+> (SLICE-5) follows. See §9.5 for the edit-metadata write-through this reuses.
 
 Every collection declares a `type` in its `.collection.yaml` manifest
 (§22.2), chosen at creation and **immutable**: one of `document`,
diff --git a/VERSION b/VERSION
index 5c4503b..564edf8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.49.0
+0.50.0
diff --git a/frontend/package.json b/frontend/package.json
index 42127af..1be35a6 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
 {
   "name": "rfc-app-frontend",
   "private": true,
-  "version": "0.49.0",
+  "version": "0.50.0",
   "type": "module",
   "scripts": {
     "dev": "vite",