docs: add persistent typing indicator to README

README.md

@@ -219,6 +219,11 @@ Stream starts → detects tool_call → accumulates full tool_call → executes
   - Adaptive backoff on Telegram flood control (429)
   - Typing cursor `▉` during generation, clean final message
   - Graceful fallback to plain send on repeated failures
+- **⌨️ Persistent Typing Indicator**: `sendChatAction('typing')` every 4s
+  - Active from message receipt through entire response (tool turns + streaming)
+  - Telegram typing expires after ~5s — 4s interval keeps it alive continuously
+  - Only stops when final response is fully delivered
+  - Ensures user always sees activity, even during long tool execution gaps
 - **🎨 Telegram HTML Formatting**: AI markdown → clean Telegram HTML
   - `**bold**`, `*italic*`, `` `code` ``, fenced code blocks, `[links](url)`, `~~strike~~`, headings, blockquotes, lists
   - Double fallback: HTML → stripped plain text (never shows raw `**`)
@@ -557,8 +562,9 @@ Z.AI API (SSE)
 | MCP servers | ✅ Full MCP protocol | ✅ Native MCP + mcporter | ❌ None |
 | RTK optimization | ✅ RTK active (60-90% savings) | ✅ RTK integrated | ❌ None |
 | **Platform** | | | |
-| Telegram integration | ✅ Native bot + webhook + streaming | ✅ 2-way Telegram bridge | ❌ None |
-| Discord | ✅ Native bot (discord.js) | ✅ Full Discord integration | ❌ None |
+|| Telegram integration | ✅ Native bot + webhook + streaming | ✅ 2-way Telegram bridge | ❌ None ||
+|| Persistent typing indicator | ✅ 4s interval, active during full response | ❌ None | ❌ None ||
+|| Discord | ✅ Native bot (discord.js) | ✅ Full Discord integration | ❌ None ||
 | Multi-channel delivery | ✅ Delivery hub (TG + DC + WS + log) | ✅ Cron→multi-platform | ❌ None |
 || **Voice** | | | |
 || Speech-to-Text | ✅ Vosk (offline, ~200ms, 68MB) | ⚠️ Whisper (needs GPU) | ❌ None |