docs(changelog): v0.2.0-dragonfork — GUI ship

Calls out the Restreamer UI bundle (which has been in the deploy
bundle since M2 but undocumented) and the new wilddragon-webrtc.html
admin page.

CHANGELOG.md

@@ -1,5 +1,57 @@
 # Datarhei — Dragon Fork
 
+## v0.2.0-dragonfork (2026-05-03)
+
+The "GUI ship" release. Everything from v0.1 is preserved; this round
+documents and ships a usable graphical surface for the WebRTC feature
+that v0.1 only exposed through the API.
+
+### Added
+
+- **Wild Dragon WebRTC admin page** at `/wilddragon-webrtc.html`. Single-file
+  HTML/JS; no build step. Sign in with the API_AUTH_USERNAME / PASSWORD
+  creds, see every process, toggle `webrtc.enabled` per-process with one
+  click, restart on change, copy the WHEP URL, jump straight to the
+  smoke player. Closes the v0.1 GUI gap — the upstream Restreamer UI
+  ships with v0.2 but doesn't know about Core's `webrtc` config block,
+  so toggling WebRTC previously required direct API calls.
+
+### Documented (was present, just unannounced)
+
+- **Restreamer UI bundle** in the TrueNAS deploy. The `deploy/truenas/core/`
+  Dockerfile builds the upstream `datarhei/restreamer-ui` v1.14.0 React
+  bundle with the Wild Dragon overlay applied (logo / favicon / header
+  title / welcome card), copies the result into Core's disk filesystem
+  via `seed-data.sh`, and Core serves it at `/`. Was added during M2
+  but not called out in the v0.1 CHANGELOG.
+- **WHEP smoke player** at `/whep-player.html`. Standalone WebRTC
+  subscriber with ICE/codec/bitrate diagnostics. Was added during M4.
+
+### Known limitations
+
+- The Restreamer UI itself has no WebRTC affordance — there's no
+  checkbox or "Enable WebRTC" toggle in its process editor. Use
+  `/wilddragon-webrtc.html` for that. A proper UI fork that adds
+  WebRTC controls inline is tracked in issue #15.
+- No published Docker image yet — `docker compose up -d --build` still
+  rebuilds from source. Tracked in issue #12.
+- WebRTC subsystem has no Prometheus instrumentation yet. Spec at
+  `docs/design/2026-05-03-datarhei-dragon-fork-webrtc-prometheus-metrics-design.md`,
+  tracked in issue #11.
+
+### Upgrade
+
+```sh
+cd deploy/truenas/core
+git pull
+docker compose up -d --build
+```
+
+The new admin page comes through `seed-data.sh` on container start;
+no `.env` changes required.
+
+---
+
 ## v0.1.0-dragonfork (2026-05-03)
 
 The first tagged Dragon Fork release. Forked from upstream datarhei