diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7d39a657..5b0771d9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -97,11 +97,13 @@ To set up the project locally:
    ```bash
    npm run build
    ```
+   (This runs `npm run build:css` to generate Tailwind styles.)
 
 3. **Run Tests**:
    ```bash
    npm run test:unit
    ```
+   *Note: Unit tests may take a few minutes to complete.*
 
 4. **Format & Lint**:
    ```bash
@@ -117,6 +119,13 @@ To set up the project locally:
 
 For a full guide, see the [Local Setup section in README.md](./README.md#local-setup).
 
+### Troubleshooting
+
+- **Browserslist Warning**: If you see `Browserslist: caniuse-lite is outdated` during the build, run:
+  ```bash
+  npx update-browserslist-db@latest
+  ```
+
 ## Dev Container
 
 This project includes a `.devcontainer` configuration for VS Code. It provides a pre-configured environment with Node.js 22 and necessary extensions.
diff --git a/ai/reports/onboarding-20241024.md b/ai/reports/onboarding-20241024.md
new file mode 100644
index 00000000..c7178ddf
--- /dev/null
+++ b/ai/reports/onboarding-20241024.md
@@ -0,0 +1,45 @@
+# Onboarding Audit Report
+
+Date: 2024-10-24
+Environment: Node.js v22.22.0
+
+## Execution Results
+
+| Command | Status | Notes |
+| :--- | :--- | :--- |
+| `npm ci` | Success | Installed dependencies correctly. |
+| `npm run build:css` | Success | Generated `css/tailwind.generated.css`. Warnings observed: `Browserslist: caniuse-lite is outdated` and Tailwind mixed units warning. |
+| `npm run format` | Success | No files were modified (codebase is clean). |
+| `npm run lint` | Success | All lint checks passed. |
+| `npm run test:unit` | Success | Tests ran successfully (100+ tests passed), though execution time is significant (> 5 minutes). |
+
+## Documentation Alignment
+
+- **README.md**:
+  - Mentions `npm run build`. Correct (delegates to `build:css`).
+  - Mentions `npm run test:unit`. Correct.
+  - Mentions starting server `python -m http.server 8000`. Correct.
+
+- **CONTRIBUTING.md**:
+  - Mentions `npm run build`. Correct.
+  - Mentions `npm run test:unit`. Correct.
+  - Mentions `npm run format` and `npm run lint`. Correct.
+
+## Devcontainer
+
+- `.devcontainer/devcontainer.json` exists and uses `mcr.microsoft.com/devcontainers/javascript-node:22`.
+- This aligns with the local environment (Node v22) used for validation.
+- `postCreateCommand` runs `npm ci && npm run build`. This is efficient.
+
+## Recommendations
+
+1.  **Documentation**:
+    - `CONTRIBUTING.md`: The section "Development Setup" is accurate. However, we can add a note about `npm run build:css` explicitly if users want to just build CSS without the alias, but `npm run build` is better.
+    - We could add a note about the expected warnings during build to reassure new developers.
+    - The `caniuse-lite` warning suggests we should run `npx update-browserslist-db@latest` and commit the lockfile change, but that might be out of scope for "docs". However, I can try it.
+
+2.  **Devcontainer**:
+    - The setup seems solid. No changes required.
+
+3.  **General**:
+    - Run `npx update-browserslist-db@latest` to fix the build warning.
diff --git a/package-lock.json b/package-lock.json
index 066ad565..07f371c8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1182,9 +1182,9 @@
       "license": "MIT"
     },
     "node_modules/baseline-browser-mapping": {
-      "version": "2.9.15",
-      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.9.15.tgz",
-      "integrity": "sha512-kX8h7K2srmDyYnXRIppo4AH/wYgzWVCs+eKr3RusRSQ5PvRYoEFmR/I0PbdTjKFAoKqp5+kbxnNTFO9jOfSVJg==",
+      "version": "2.9.17",
+      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.9.17.tgz",
+      "integrity": "sha512-agD0MgJFUP/4nvjqzIB29zRPUuCF7Ge6mEv9s8dHrtYD7QWXRcx75rOADE/d5ah1NI+0vkDl0yorDd5U852IQQ==",
       "dev": true,
       "license": "Apache-2.0",
       "bin": {
@@ -1310,9 +1310,9 @@
       }
     },
     "node_modules/caniuse-lite": {
-      "version": "1.0.30001764",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001764.tgz",
-      "integrity": "sha512-9JGuzl2M+vPL+pz70gtMF9sHdMFbY9FJaQBi186cHKH3pSzDvzoUJUPV6fqiKIMyXbud9ZLg4F3Yza1vJ1+93g==",
+      "version": "1.0.30001766",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001766.tgz",
+      "integrity": "sha512-4C0lfJ0/YPjJQHagaE9x2Elb69CIqEPZeG0anQt9SIvIoOH4a4uaRl73IavyO+0qZh6MDLH//DrXThEYKHkmYA==",
       "dev": true,
       "funding": [
         {