feat(telegram): wire replyToMode config, add forum topic support, fix messaging tool duplicates

Changes:
- Default replyToMode from "off" to "first" for better threading UX
- Add messageThreadId and replyToMessageId params for forum topic support
- Add messaging tool duplicate detection to suppress redundant block replies
- Add sendMessage action to telegram tool schema
- Add @grammyjs/types devDependency for proper TypeScript typing
- Remove @ts-nocheck and fix all type errors in send.ts
- Add comprehensive docs/telegram.md documentation
- Add PR-326-REVIEW.md with John Carmack-level code review

Test coverage:
- normalizeTextForComparison: 5 cases
- isMessagingToolDuplicate: 7 cases
- sendMessageTelegram thread params: 5 cases
- handleTelegramAction sendMessage: 4 cases
- Forum topic isolation: 4 cases

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/agents/pi-embedded-runner.ts

@@ -223,6 +223,9 @@ export type EmbeddedPiRunResult = {
     isError?: boolean;
   }>;
   meta: EmbeddedPiRunMeta;
+  // True if a messaging tool (telegram, whatsapp, discord, slack, sessions_send)
+  // successfully sent a message. Used to suppress agent's confirmation text.
+  didSendViaMessagingTool?: boolean;
 };
 
 export type EmbeddedPiCompactResult = {
@@ -1250,6 +1253,7 @@ export async function runEmbeddedPiAgent(params: {
             toolMetas,
             unsubscribe,
             waitForCompactionRetry,
+            didSendViaMessagingTool,
           } = subscription;
 
           const queueHandle: EmbeddedPiQueueHandle = {
@@ -1531,6 +1535,7 @@ export async function runEmbeddedPiAgent(params: {
               agentMeta,
               aborted,
             },
+            didSendViaMessagingTool: didSendViaMessagingTool(),
           };
         } finally {
           restoreSkillEnv?.();