v0.0.21: TUI overhaul, WZP call infrastructure, security hardening, federation

TUI:
- Split 1,756-line app.rs monolith into 7 modules (types, draw, commands, input, file_transfer, network, mod)
- Message timestamps [HH:MM], scrolling (PageUp/Down/arrows), connection status dot, unread badge
- /help command, terminal bell on incoming DM, /devices + /kick commands
- 44 unit tests (types, input, draw with TestBackend)

Server — WZP Call Infrastructure (FC-2/3/5/6/7/10):
- Call state management (CallState, CallStatus, active_calls, calls + missed_calls sled trees)
- WS call signal awareness (Offer/Answer/Hangup update state, missed call on offline)
- Group call endpoint (POST /groups/:name/call with SHA-256 room ID, fan-out)
- Presence API (GET /presence/:fp, POST /presence/batch)
- Missed call flush on WS reconnect
- WZP relay config + CORS

Server — Security (FC-P1):
- Auth enforcement middleware (AuthFingerprint extractor on 13 write handlers)
- Session auto-recovery (delete corrupted ratchet, show [session reset])
- WS connection cap (5/fingerprint) + global concurrency limit (200)
- Device management (GET /devices, POST /devices/:id/kick, POST /devices/revoke-all)

Server — Federation:
- Two-server federation via JSON config (--federation flag)
- Periodic presence sync (every 5s, full-state, self-healing)
- Message forwarding via HTTP POST with SHA-256(secret||body) auth
- Graceful degradation (peer down = queue locally)
- deliver_or_queue() replaces push-or-queue in ws.rs + messages.rs

Client — Group Messaging:
- SenderKeyDistribution storage + GroupSenderKey decryption in TUI
- sender_keys sled tree in LocalDb

WASM:
- All 8 WireMessage variants handled (no more "unsupported")
- decrypt_group_message() + create_sender_key_from_distribution() exports
- CallSignal parsing with signal_type mapping

Docs:
- ARCHITECTURE.md rewritten with Mermaid diagrams
- README.md created
- TASK_PLAN.md with FC-P{phase}-T{task} naming
- PROGRESS.md updated to v0.0.21

WZP submodule updated to 6f4e8eb (IAX2 trunking, adaptive quality, metrics, all S-tasks done)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/crates/warzone-server/src/routes/presence.rs

@@ -0,0 +1,57 @@
+use axum::{
+    extract::{Path, State},
+    routing::{get, post},
+    Json, Router,
+};
+use serde::Deserialize;
+
+use crate::errors::AppResult;
+use crate::state::AppState;
+
+pub fn routes() -> Router<AppState> {
+    Router::new()
+        .route("/presence/:fingerprint", get(get_presence))
+        .route("/presence/batch", post(batch_presence))
+}
+
+fn normalize_fp(fp: &str) -> String {
+    fp.chars().filter(|c| c.is_ascii_hexdigit()).collect::<String>().to_lowercase()
+}
+
+async fn get_presence(
+    State(state): State<AppState>,
+    Path(fingerprint): Path<String>,
+) -> AppResult<Json<serde_json::Value>> {
+    let fp = normalize_fp(&fingerprint);
+    let online = state.is_online(&fp).await;
+    let devices = state.device_count(&fp).await;
+    Ok(Json(serde_json::json!({
+        "fingerprint": fp,
+        "online": online,
+        "devices": devices,
+    })))
+}
+
+#[derive(Deserialize)]
+struct BatchRequest {
+    fingerprints: Vec<String>,
+}
+
+async fn batch_presence(
+    _auth: crate::auth_middleware::AuthFingerprint,
+    State(state): State<AppState>,
+    Json(req): Json<BatchRequest>,
+) -> AppResult<Json<serde_json::Value>> {
+    let mut results = Vec::new();
+    for fp in &req.fingerprints {
+        let fp = normalize_fp(fp);
+        let online = state.is_online(&fp).await;
+        let devices = state.device_count(&fp).await;
+        results.push(serde_json::json!({
+            "fingerprint": fp,
+            "online": online,
+            "devices": devices,
+        }));
+    }
+    Ok(Json(serde_json::json!({ "results": results })))
+}