chore: import upstream snapshot with attribution

docs/devin.md

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+---
+summary: "Devin provider auth, quota endpoint, and setup."
+read_when:
+  - Adding or modifying the Devin provider
+  - Debugging Devin localStorage import or quota parsing
+  - Explaining Devin setup
+---
+
+# Devin Provider
+
+The Devin provider tracks included daily and weekly usage quotas from
+[app.devin.ai](https://app.devin.ai).
+
+## Setup
+
+1. Sign in to Devin in Google Chrome.
+2. Open the organization Usage & Limits page once.
+3. Enable **Devin** in **Settings → Providers**.
+
+Automatic mode reads only the Devin session and organization metadata from Chrome localStorage. It does not scan other
+browsers. CodexBar sends the session token only to `https://app.devin.ai`.
+
+## Manual Auth
+
+Set **Auth source** to **Manual**, then paste either the bare token or the full `Authorization: Bearer ...` header value
+from an app.devin.ai API request. The optional organization field accepts a slug, an internal `org_...` ID, or the full
+organization URL.
+
+Environment overrides:
+
+- `DEVIN_BEARER_TOKEN` or `DEVIN_AUTHORIZATION`
+- `DEVIN_ORGANIZATION` or `DEVIN_ORG`
+
+## Data Source
+
+CodexBar requests:
+
+```text
+GET https://app.devin.ai/api/<internal-org-id>/billing/quota/usage
+```
+
+The response supplies daily and weekly usage percentages plus reset timestamps. If Devin changes or expires the browser
+session, sign in again and refresh CodexBar.