feat(devin-ai): add Lifeguard rules (#3949)

Author: tjuanitas

devin_lifeguard.yaml

@@ -0,0 +1,54 @@
+rules:
+  - name: localize-messages
+    trigger: >-
+      when adding user-facing text or aria-label attributes, ensure the
+      strings are localized
+
+      for example: aria-label="Expand" should instead use formatMessage(...)
+    solution: >-
+      wrap any user-visible string in formatMessage from useIntl so that it can
+      be properly localized
+
+      e.g. aria-label={formatMessage(messages.someLabel)}
+  - name: use-intl-hook
+    trigger: >-
+      when a component imports or uses injectIntl from 'react-intl' instead of
+      using useIntl
+    solution: >-
+      remove injectIntl usage and refactor the component to use useIntl
+      directly. for example:
+
+      import { useIntl } from 'react-intl';
+
+      const { formatMessage } = useIntl();
+  - name: use-blueprint-tokens
+    trigger: >-
+      when adding or modifying styles, if numeric px values are used, prefer
+      blueprint tokens
+    solution: |-
+      avoid hard-coded px. use blueprint tokens (e.g. $space-2, $space-3) or
+      existing scss variables for consistent theming
+  - name: testing-literal-strings
+    trigger: >-
+      when writing tests for localized text, if the code checks against a
+      variable reference or message ID, the test won't fail if the translation
+      changes.
+    solution: >-
+      use the literal translated string in the test assertion so that the test
+      accurately fails when the copy changes, for example getByRole('button', {
+      name: 'Choose' }) instead of referencing a variable or ID.
+  - name: match-peer-and-dev-deps
+    trigger: >-
+      mismatch in version constraints for peerDependencies and devDependencies
+      for the same library
+    solution: >-
+      ensure that the peerDependencies version matches devDependencies version
+      to avoid unexpected version conflicts
+  - name: avoid-data-testid
+    trigger: >-
+      when writing tests, if there's a role or accessible label or text
+      available, data-testid should be avoided to ensure we test the actual
+      accessibility.
+    solution: >-
+      use queries like getByRole, getByLabelText, or getByText with the actual
+      user-facing string or aria-label. Only use test IDs as a last resort.