Add CodeRabbit configuration for PR reviews

This configuration file sets up CodeRabbit's behavior for PR summaries and reviews, including instructions for summarizing changes, review profiles, and file exclusions.

.coderabbit.yaml

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+# Automatically generated PR summaries
+description:
+  # Do you want CodeRabbit to actually edit the PR description body? (Highly recommended)
+  collapse_walkthrough: false
+  instructions: |
+    Summarize the changes clearly. 
+    Format the summary with bullet points.
+    Highlight any potential breaking changes for users.
+
+# How aggressive and deep the reviews should be
+reviews:
+  # 'chill' (fewer comments, only critical bugs) or 'assertive' (strict, points out everything)
+  profile: assertive
+  
+  # Should CodeRabbit formally "Request Changes" (which can block merging) or just leave comments?
+  # For open-source, 'false' is usually better so it doesn't block community contributors aggressively.
+  request_changes_workflow: false
+  
+  # High-level rules for the AI to follow during review
+  instructions: |
+    - We use early returns to avoid deep nesting.
+    - Ensure all public functions have docstrings.
+    - Flag any hardcoded strings; they should be in the constants file.
+    - Check for edge cases like null values or empty arrays.
+    - Suggest performance optimizations where appropriate.
+
+# What files should the AI ignore? (Crucial to save time and avoid noise)
+path_filters:
+  # Files to ALWAYS ignore
+  exclude:
+    - "**/*.md"             # Ignore markdown docs
+    - "package-lock.json"   # Ignore lock files
+    - "yarn.lock"
+    - "dist/**"             # Ignore compiled output
+    - "test/mocks/**"       # Ignore mock data