docs: note planned Element Call fork (Lotus Call)

Tag the EC embed row and add a callout explaining the plan to fork
element-hq/element-call and self-build it for true ownership (decorations,
focus/screenshare, reconnect mic, theming, call-audio injection — all unfixable
against the prebuilt @element-hq/element-call-embedded bundle). Infra notes:
EC uses our LiveKit SFU (livekit/, LXC 151) + lk-jwt-service; a new build/deploy
pipeline will be needed. Full plan: LotusGuild/cinny → HANDOFF_ELEMENT_CALL_FORK.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -50,7 +50,7 @@ matrix/
 
 | Service | IP | LXC | RAM | Disk | Versions |
 |---------|----|-----|-----|------|----------|
-| Synapse | 10.10.10.29 | 151 | 8GB | 50GB | Synapse 1.149.0, LiveKit 1.9.11, hookshot 7.3.2, coturn latest |
+| Synapse | 10.10.10.29 | 151 | 8GB | 50GB | Synapse 1.155.0, LiveKit 1.9.11, hookshot 7.3.2, coturn latest |
 | PostgreSQL 17 | 10.10.10.44 | 109 | 6GB | 30GB | PostgreSQL 17.9 |
 | Cinny Web | 10.10.10.6 | 106 | 2GB | 8GB | Debian 12, nginx, Node 24, Lotus Cinny fork (custom, tracks `cinnyapp/cinny` main) |
 | Draupnir | 10.10.10.24 | 110 | 1GB | 10GB | Draupnir v2.9.0, Node.js v22 |
@@ -454,13 +454,35 @@ chmod 600 /etc/cinny-monitor.env
 
 **Why 8GB RAM:** Vite's build process needs ~6GB Node heap (`--max_old_space_size=6144`) for the rendering-chunks phase. Previously at 4GB — OOM killed during render.
 
+### 🔱 Planned: Element Call fork — "Lotus Call" (true ownership)
+
+We currently embed Element Call as a **pre-built npm bundle**
+(`@element-hq/element-call-embedded` 0.20.1, copied to cinny `public/element-call/`).
+We can steer it (widget API + same-origin DOM hacks) but **cannot change its
+compiled logic** — so several in-call issues (avatar decorations on tiles, camera
+focus/fullscreen during screenshare, mic-after-reconnect, native theming, real
+call-audio injection for a soundboard) are unfixable from outside.
+
+**Plan: fork `element-hq/element-call` → a new `LotusGuild/element-call` repo,
+build it from source, host our build, and replace the npm bundle.** This is AGPL
+(same license, compatible). Infra implications for THIS repo:
+- EC talks to our **LiveKit SFU** (`livekit/`, LXC 151) + `lk-jwt-service` — the
+  fork's runtime `config.json` must point at `matrix.lotusguild.org` + our
+  LiveKit. The current cinny EC `config.json` lives in `cinny/config.json` here.
+- A new build/deploy pipeline for the EC fork will be needed (likely its own LXC
+  or CI artifact), analogous to the cinny build on LXC 106.
+
+**Full handoff & step-by-step plan:** `LotusGuild/cinny` →
+[`HANDOFF_ELEMENT_CALL_FORK.md`](https://code.lotusguild.org/LotusGuild/cinny/src/branch/lotus/HANDOFF_ELEMENT_CALL_FORK.md).
+Start a fresh session with that doc.
+
 ### Custom Features
 
 All custom code lives in `src/app/` on the `lotus` branch of `code.lotusguild.org/LotusGuild/cinny`. Changes survive upstream merges as long as they don't conflict with the same files upstream touched.
 
 | Feature | Files | Notes |
 |---------|-------|-------|
-| **Element Call embed** | `src/app/plugins/call/`, `src/app/hooks/useCallEmbed.ts`, `src/app/components/CallEmbedProvider.tsx` | EC 0.20.1 (`@element-hq/element-call-embedded`), dist copied to `public/element-call/` by vite |
+| **Element Call embed** | `src/app/plugins/call/`, `src/app/hooks/useCallEmbed.ts`, `src/app/components/CallEmbedProvider.tsx` | EC 0.20.1 (`@element-hq/element-call-embedded`), **prebuilt** dist copied to `public/element-call/` by vite. Same-origin (`allow-same-origin`), controlled via `matrix-widget-api` + DOM-poking. 🔱 **[EC-FORK]** planned — see `LotusGuild/cinny` → `HANDOFF_ELEMENT_CALL_FORK.md` |
 | **DM calls** | `src/app/features/room/Room.tsx`, `src/app/features/room/RoomViewHeader.tsx` | Phone button in DM room header; `useCallStart(true)` passes `intent: StartedByUser`; Room.tsx switches to CallView layout when DM has active call |
 | **Picture-in-picture call** | `src/app/components/CallEmbedProvider.tsx` | When navigating away from the call room, the embed shrinks to a 280×158px PiP in the bottom-right. Click navigates back. Implemented via `useEffect` imperatively overriding styles on `callEmbedRef.current` — cannot use a wrapper div because `useCallEmbedPlacementSync` writes `top/left/width/height` directly onto that element |
 | **Screenshare fullscreen** | `src/app/features/call/CallControls.tsx`, `src/app/features/call/Controls.tsx` | When screensharing, a fullscreen button appears in call controls. Calls `callEmbedRef.current?.requestFullscreen()` on the Cinny call container. EC naturally spotlights the screenshare — the old 600ms grid-revert code was removed (it caused fullscreen to show avatars instead of the screen) |
@@ -521,8 +543,12 @@ Periodic `TLS/TCP socket error: Connection reset by peer` in coturn logs. Normal
 
 ## Server Checklist
 
+## Server Checklist
+
 ### Quality of Life
+- [x] **Upgrade Synapse to v1.155.0** — Done 2026-06-18. LXC 151 was already on Debian 13 Trixie; no OS migration needed.
 - [x] Migrate from SQLite to PostgreSQL
+
 - [x] TURN/STUN server (coturn) for reliable voice/video
 - [x] URL previews
 - [x] Upload size limit 200MB
@@ -734,7 +760,7 @@ All commands use the `!` prefix. Run `!help` in any room for the full list.
 
 | Component | Technology | Version |
 |-----------|-----------|---------|
-| Homeserver | Synapse | 1.149.0 |
+| Homeserver | Synapse | 1.155.0 |
 | Database | PostgreSQL | 17.9 |
 | TURN | coturn | latest |
 | Video/voice calls | LiveKit SFU | 1.9.11 |