diff --git a/AI_INIT.md b/AI_INIT.md
index f27f85b..8b2d2e4 100644
--- a/AI_INIT.md
+++ b/AI_INIT.md
@@ -29,9 +29,9 @@ KoalaSync is a specialized tool for **synchronized video playback** across multi
 
 ## 3. Mandatory Reading
 Before touching any code, you MUST read the following documents in order:
-1. [ARCHITECTURE.md](ARCHITECTURE.md) – Detailed communication flows, Dual Heartbeat, and two-phase sync protocol.
+1. [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md) – Detailed communication flows, Dual Heartbeat, and two-phase sync protocol.
 2. [extension/README.md](extension/README.md) – Extension components, tab structure, and loading process.
-3. [SYNC_GUIDE.md](SYNC_GUIDE.md) – Protocol constants and synchronization requirements.
+3. [docs/SYNC_GUIDE.md](docs/SYNC_GUIDE.md) – Protocol constants and synchronization requirements.
 
 ## 4. The "Vanilla JS Mirror" Pattern
 To avoid boot-time race conditions in Manifest V3 without a bundler, the following architectural trade-off is enforced:
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..8d8c381
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,35 @@
+# Contributing to KoalaSync
+
+Thank you for your interest in contributing to KoalaSync! We welcome all contributions, from bug reports to new features.
+
+## Development Workflow
+
+### 1. Prerequisites
+- Node.js (v18+)
+- Docker (for local server testing)
+
+### 2. Setup
+1. Clone the repository.
+2. Run `npm install` in the root directory to install build dependencies.
+
+### 3. Protocol Synchronization
+KoalaSync uses a "Single Source of Truth" for protocol constants in `shared/constants.js`. 
+- **CRITICAL**: If you modify the constants, you MUST run the build script:
+  ```bash
+  node scripts/build-extension.js
+  ```
+  This will automatically synchronize the changes to the extension and generate the browser-specific bundles in the `dist/` folder.
+
+### 4. Code Standards
+- **Vanilla JS**: The extension must remain dependency-free. Do not add npm packages to the `extension/` directory.
+- **Privacy**: Do not add external requests (CDNs, fonts, etc.).
+- **Comments**: Maintain the existing documentation style, especially for complex sync logic.
+
+## Pull Request Process
+1. Create a new branch for your feature or bugfix.
+2. Ensure your code is tested locally (Chrome and Firefox).
+3. Update relevant documentation (e.g., `docs/ARCHITECTURE.md` if you change the protocol).
+4. Submit your PR with a clear description of the changes.
+
+## Security
+If you find a security vulnerability, please do not open a public issue. Instead, refer to our `SECURITY.md` for disclosure instructions.
diff --git a/PRIVACY.md b/PRIVACY.md
new file mode 100644
index 0000000..6230876
--- /dev/null
+++ b/PRIVACY.md
@@ -0,0 +1,27 @@
+# Privacy Policy
+
+KoalaSync is built with a **Privacy-First** architecture. We believe that your browsing habits and watch history are your business, not ours.
+
+## 1. Zero External Requests
+The KoalaSync extension and its official marketing website are designed to be completely self-contained.
+- **No CDNs**: We do not load scripts or styles from external Content Delivery Networks.
+- **No Google Fonts**: We use a modern system font stack to avoid tracking by third-party font services.
+- **No Analytics**: There are no tracking pixels, telemetry, or analytics scripts (like Google Analytics or Mixpanel) in the codebase.
+
+## 2. Data Sovereignty
+- **Self-Hostable**: You can host your own relay server using our Docker image, giving you 100% control over your data.
+- **Memory-Only State**: The relay server stores all room data in RAM. Nothing is written to a database or disk. When a room is empty, it is purged immediately.
+- **No Logs**: The official relay server (`sync.shik3i.net`) does not log user IP addresses or room activity.
+
+## 3. Extension Permissions
+KoalaSync requires the following permissions to function:
+- `storage`: To remember your username and server preferences locally.
+- `tabs` & `scripting`: To detect video elements on pages you visit so they can be synchronized.
+- `<all_urls>`: Necessary because KoalaSync works on any website with a `<video>` tag.
+
+## 4. Zero Data Collection
+We do not collect, store, or sell any personal information. Your `peerId` and `username` are stored only on your local device and transmitted only to the relay server you choose to connect to.
+
+---
+
+**KoalaSync is and always will be Open Source.** You are encouraged to audit the code yourself on [GitHub](https://github.com/Shik3i/KoalaSync).
diff --git a/README.md b/README.md
index 2c1a4da..ac08095 100644
--- a/README.md
+++ b/README.md
@@ -15,10 +15,16 @@ KoalaSync is a premium, lightweight Browser Extension and Relay Server for synch
 - `server/`: Node.js + Socket.IO Relay Server (Containerized).
 - `website/`: Marketing landing page & **Invitation Bridge**.
 - `shared/`: Protocol constants and domain blacklist.
-- `scripts/`: Development utilities for protocol synchronization.
+- `scripts/`: Development utilities (Build & Sync).
+- `docs/`: Technical documentation ([ARCHITECTURE.md](docs/ARCHITECTURE.md), [SYNC_GUIDE.md](docs/SYNC_GUIDE.md)).
 
-> [!NOTE]
-> For deep technical dives, see [ARCHITECTURE.md](ARCHITECTURE.md) and [SYNC_GUIDE.md](SYNC_GUIDE.md).
+## 🔒 Privacy & Security
+KoalaSync is built for users who value privacy. 
+- **Zero Collection**: We do not collect or sell your data.
+- **Zero Telemetry**: No analytics or tracking scripts.
+- **Zero Dependencies**: The extension uses 100% Vanilla JS for maximum security.
+- **Self-Hostable**: Full Docker support for private relay servers.
+See [PRIVACY.md](PRIVACY.md) for our full commitment.
 
 ## Key Features
 - **Global Synchronization**: Synchronize Play, Pause, and Seeking on any website with a `<video>` tag.
diff --git a/assets/SOCIAL_PREVIEW.png b/assets/SOCIAL_PREVIEW.png
new file mode 100644
index 0000000..5bf2253
Binary files /dev/null and b/assets/SOCIAL_PREVIEW.png differ
diff --git a/ARCHITECTURE.md b/docs/ARCHITECTURE.md
similarity index 100%
rename from ARCHITECTURE.md
rename to docs/ARCHITECTURE.md
diff --git a/docs/README.md b/docs/README.md
new file mode 100644
index 0000000..32e5806
--- /dev/null
+++ b/docs/README.md
@@ -0,0 +1,6 @@
+# Technical Documentation
+
+This directory contains deep-dives into the KoalaSync protocol and architecture.
+
+- [ARCHITECTURE.md](ARCHITECTURE.md): Communication flows, Dual Heartbeat, and Sync logic.
+- [SYNC_GUIDE.md](SYNC_GUIDE.md): Protocol constants and sync requirements.
diff --git a/SYNC_GUIDE.md b/docs/SYNC_GUIDE.md
similarity index 100%
rename from SYNC_GUIDE.md
rename to docs/SYNC_GUIDE.md
diff --git a/extension/content.js b/extension/content.js
index 031880c..912077d 100644
--- a/extension/content.js
+++ b/extension/content.js
@@ -14,7 +14,8 @@
     }
     window.koalaSyncInjected = true;
 
-    // Local Protocol Constants (Mirroring shared/constants.js)
+    // --- SHARED_EVENTS_INJECT_START ---
+    // This block is automatically updated by /scripts/build-extension.js
     const EVENTS = {
         PLAY: "play",
         PAUSE: "pause",
@@ -26,6 +27,7 @@
         EPISODE_LOBBY: "episode_lobby",
         EPISODE_READY: "episode_ready"
     };
+    // --- SHARED_EVENTS_INJECT_END ---
 
     let expectedEvents = new Set();
     let expectedTimeouts = {};
diff --git a/scripts/build-extension.js b/scripts/build-extension.js
index 6299d06..142eb3e 100644
--- a/scripts/build-extension.js
+++ b/scripts/build-extension.js
@@ -37,17 +37,51 @@ console.log('✓ constants.js and blacklist.js synced to extension/shared/');
 const baseManifest = JSON.parse(fs.readFileSync(baseManifestPath, 'utf8'));
 
 // Helper to copy files, ignoring manifest.json and manifest.base.json
+// Also injects shared constants into content.js
 function copyExtensionFiles(targetDir) {
   fs.mkdirSync(targetDir, { recursive: true });
+  
+  // Read master constants for injection
+  const masterConstantsPath = path.join(rootDir, 'shared', 'constants.js');
+  const constantsContent = fs.readFileSync(masterConstantsPath, 'utf8');
+  
+  // Extract the EVENTS object using regex
+  const eventsMatch = constantsContent.match(/export const EVENTS = ({[\s\S]+?});/);
+  if (!eventsMatch) {
+    throw new Error('CRITICAL: Could not find EVENTS object in shared/constants.js');
+  }
+  const eventsObject = eventsMatch[1];
+  
   const items = fs.readdirSync(extDir);
   for (const item of items) {
     if (item === 'manifest.json' || item === 'manifest.base.json') continue;
+    
     const srcPath = path.join(extDir, item);
     const destPath = path.join(targetDir, item);
+    
     if (fs.lstatSync(srcPath).isDirectory()) {
       fs.cpSync(srcPath, destPath, { recursive: true });
     } else {
-      fs.copyFileSync(srcPath, destPath);
+      if (item === 'content.js') {
+        // Perform injection
+        let content = fs.readFileSync(srcPath, 'utf8');
+        const startMarker = '// --- SHARED_EVENTS_INJECT_START ---';
+        const endMarker = '// --- SHARED_EVENTS_INJECT_END ---';
+        
+        const pattern = new RegExp(`${startMarker}[\\s\\S]+?${endMarker}`);
+        const replacement = `${startMarker}\n    // This block is automatically updated by /scripts/build-extension.js\n    const EVENTS = ${eventsObject};\n    ${endMarker}`;
+        
+        if (pattern.test(content)) {
+          content = content.replace(pattern, replacement);
+          fs.writeFileSync(destPath, content);
+          console.log('✓ Injected shared events into content.js');
+        } else {
+          console.warn('⚠️ WARNING: Markers not found in content.js, skipping injection.');
+          fs.copyFileSync(srcPath, destPath);
+        }
+      } else {
+        fs.copyFileSync(srcPath, destPath);
+      }
     }
   }
 }