fix(ui): correct mirrored chat empty-state + clipped IP placeholder; add readiness-check skill; privacy page nav/meta

- app/session/[id].tsx: chat empty-state rendered mirrored on Android (inverted FlatList) — now an untransformed overlay
- app/connection/add.tsx: shortened clipped host placeholder
- .agents/skills/readiness-check: production-readiness gate (Play+F-Droid published, app+site health)
- docs/privacy: back-nav + canonical/theme-color/description meta
Verified: tsc clean, CUA smoke green (run 26814702062)

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

app/connection/add.tsx

@@ -165,7 +165,7 @@ export default function AddConnectionScreen() {
         <View style={styles.ipRow}>
           <TextInput
             style={[styles.input, styles.ipInput, isDark && styles.inputDark]}
-            placeholder="192.168.1.100 or my-mac.ts.net"
+            placeholder="192.168.1.100"
             placeholderTextColor={isDark ? "#666666" : "#999999"}
             value={ip}
             onChangeText={setIp}