feat: unified messaging TUI MVP — Synapse + 7 mautrix bridges + Textual TUI + MCP draft staging

One-command local stack: cp .env.example .env && make up. Idempotent
bootstrap renders Synapse + bridge configs from pristine upstream examples,
provisions databases, registrations, double puppeting, and the admin user.
Textual TUI with bridge manager, in-terminal QR login, and drafts panel.
MCP server exposes read tools and a human-gated draft send workflow.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,39 @@
+# ── Vortex unified messaging stack ─────────────────────────────────
+# Copy to .env, edit, then `make up`. Nothing else to configure.
+
+# Matrix server name (domain part of user IDs). Keep `localhost` for local use.
+MATRIX_SERVER_NAME=localhost
+
+# Admin account created automatically on first boot.
+MATRIX_USER=admin
+MATRIX_PASSWORD=changeme
+
+# Postgres superuser password (user: vortex).
+POSTGRES_PASSWORD=changeme
+
+# Shared secret for Synapse admin registration. `auto` = generated once and
+# persisted to the data volume.
+REGISTRATION_SHARED_SECRET=auto
+
+# Shared secret for bridge double puppeting (appservice method). `auto` = generated.
+DOUBLEPUPPET_SHARED_SECRET=auto
+
+# Which bridges to run. Comma-separated, no spaces.
+# Full set: gmessages,telegram,whatsapp,twitter,linkedin,discord,meta
+BRIDGES_ENABLED=gmessages,telegram,whatsapp,twitter,linkedin,discord,meta
+# Compose starts exactly the bridges listed above (do not edit this line):
+COMPOSE_PROFILES=${BRIDGES_ENABLED}
+
+# Telegram needs API credentials from https://my.telegram.org.
+# Leave empty to skip the Telegram bridge gracefully (its container idles with a log line).
+TELEGRAM_API_ID=
+TELEGRAM_API_HASH=
+
+# MCP server (streamable HTTP) host port.
+MCP_HTTP_PORT=8765
+
+# When false (default), the MCP send_draft tool refuses to send; a human must
+# send drafts from the TUI. Set true to let AI agents send staged drafts.
+MCP_ALLOW_SEND=false
+
+TZ=UTC