feat: full service exposure with grammy bot + claudegram patterns

- Rewrote bot/index.js using grammy (@grammyjs/auto-retry + runner)
- Added deduplication.js (adapted from claudegram)
- Added request-queue.js (per-chat sequential processing)
- Added message-sender.js (chunking + Markdown fallback)
- Wired all JS-shim services: tools, skills, agents, config, RTK
- Added function calling support to ZAIProvider.chat()
- Added dynamic command routing (tools, skills, agents, model, stats)
- Added per-agent delegation commands (/agent_coder, /agent_architect, etc.)
- Added dedup + queue patterns from claudegram's battle-tested codebase
- Updated zcode.js to pass agents to initBot()
- Updated README feature comparison table to reflect real capabilities

src/bot/deduplication.js

@@ -0,0 +1,27 @@
+// Copied from claudegram — proven deduplication pattern
+const processedMessages = new Map();
+const MESSAGE_TTL = 60000;
+let cleanupInterval = null;
+
+export function isDuplicate(messageId) {
+  return processedMessages.has(messageId);
+}
+
+export function markProcessed(messageId) {
+  processedMessages.set(messageId, Date.now());
+  ensureCleanupRunning();
+}
+
+function ensureCleanupRunning() {
+  if (cleanupInterval) return;
+  cleanupInterval = setInterval(() => {
+    const now = Date.now();
+    for (const [id, timestamp] of processedMessages) {
+      if (now - timestamp > MESSAGE_TTL) processedMessages.delete(id);
+    }
+    if (processedMessages.size === 0 && cleanupInterval) {
+      clearInterval(cleanupInterval);
+      cleanupInterval = null;
+    }
+  }, 30000);
+}