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-helpers.test.ts

@@ -5,6 +5,8 @@ import {
   buildBootstrapContextFiles,
   formatAssistantErrorText,
   isContextOverflowError,
+  isMessagingToolDuplicate,
+  normalizeTextForComparison,
   sanitizeGoogleTurnOrdering,
   validateGeminiTurns,
 } from "./pi-embedded-helpers.js";
@@ -247,3 +249,86 @@ describe("sanitizeGoogleTurnOrdering", () => {
     expect(out).toBe(input);
   });
 });
+
+describe("normalizeTextForComparison", () => {
+  it("lowercases text", () => {
+    expect(normalizeTextForComparison("Hello World")).toBe("hello world");
+  });
+
+  it("trims whitespace", () => {
+    expect(normalizeTextForComparison("  hello  ")).toBe("hello");
+  });
+
+  it("collapses multiple spaces", () => {
+    expect(normalizeTextForComparison("hello    world")).toBe("hello world");
+  });
+
+  it("strips emoji", () => {
+    expect(normalizeTextForComparison("Hello 👋 World 🌍")).toBe("hello world");
+  });
+
+  it("handles mixed normalization", () => {
+    expect(normalizeTextForComparison("  Hello 👋   WORLD  🌍  ")).toBe(
+      "hello world",
+    );
+  });
+});
+
+describe("isMessagingToolDuplicate", () => {
+  it("returns false for empty sentTexts", () => {
+    expect(isMessagingToolDuplicate("hello world", [])).toBe(false);
+  });
+
+  it("returns false for short texts", () => {
+    expect(isMessagingToolDuplicate("short", ["short"])).toBe(false);
+  });
+
+  it("detects exact duplicates", () => {
+    expect(
+      isMessagingToolDuplicate("Hello, this is a test message!", [
+        "Hello, this is a test message!",
+      ]),
+    ).toBe(true);
+  });
+
+  it("detects duplicates with different casing", () => {
+    expect(
+      isMessagingToolDuplicate("HELLO, THIS IS A TEST MESSAGE!", [
+        "hello, this is a test message!",
+      ]),
+    ).toBe(true);
+  });
+
+  it("detects duplicates with emoji variations", () => {
+    expect(
+      isMessagingToolDuplicate("Hello! 👋 This is a test message!", [
+        "Hello! This is a test message!",
+      ]),
+    ).toBe(true);
+  });
+
+  it("detects substring duplicates (LLM elaboration)", () => {
+    expect(
+      isMessagingToolDuplicate(
+        'I sent the message: "Hello, this is a test message!"',
+        ["Hello, this is a test message!"],
+      ),
+    ).toBe(true);
+  });
+
+  it("detects when sent text contains block reply (reverse substring)", () => {
+    expect(
+      isMessagingToolDuplicate("Hello, this is a test message!", [
+        'I sent the message: "Hello, this is a test message!"',
+      ]),
+    ).toBe(true);
+  });
+
+  it("returns false for non-matching texts", () => {
+    expect(
+      isMessagingToolDuplicate("This is completely different content.", [
+        "Hello, this is a test message!",
+      ]),
+    ).toBe(false);
+  });
+});