add(repo): ci badge, dependabot, and contributing guide

Author: Tom-Ryder

.github/dependabot.yml

@@ -0,0 +1,11 @@
+version: 2
+updates:
+  - package-ecosystem: "swift"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

CONTRIBUTING.md

@@ -0,0 +1,54 @@
+# Contributing to AgentRunKit
+
+Thanks for your interest in contributing.
+
+## Setup
+
+```bash
+# Install tools
+make bootstrap
+
+# Verify everything works
+make check
+```
+
+`make bootstrap` installs [Mint](https://github.com/yonaskolb/Mint) and the pinned versions of SwiftFormat and SwiftLint from the `Mintfile`.
+
+## Before Submitting a PR
+
+Run the full gate:
+
+```bash
+make check
+```
+
+This runs `swiftformat`, `swiftlint --strict`, and `swift test`. CI runs the same checks — if `make check` passes locally, CI will pass.
+
+## Code Style
+
+- SwiftFormat and SwiftLint enforce the style. Don't fight the tools.
+- No comments or docstrings unless explaining a non-obvious *why*.
+- No backward-compatibility hacks. Prefer the most elegant solution.
+- All public types must be `Sendable`.
+
+See `CLAUDE.md` for the full coding standards.
+
+## Commit Messages
+
+Format: `verb(scope): description`
+
+```
+add(gemini): google gemini client with streaming and tool calling
+fix(auth): prevent token refresh race on concurrent requests
+refactor(api): extract shared validation into middleware
+```
+
+Single sentence, lowercase, imperative mood, no trailing period.
+
+## Tests
+
+Every change needs tests. Test behavior, not implementation details. Run with:
+
+```bash
+swift test --filter YourTestSuite
+```

README.md

@@ -5,6 +5,7 @@
 </p>
 
 <p align="center">
+  <a href="https://github.com/Tom-Ryder/AgentRunKit/actions/workflows/ci.yml"><img src="https://github.com/Tom-Ryder/AgentRunKit/actions/workflows/ci.yml/badge.svg" alt="CI"></a>
   <img src="https://img.shields.io/badge/Swift-6.0-orange" alt="Swift 6.0">
   <img src="https://img.shields.io/badge/Platforms-iOS%2018%20%7C%20macOS%2015-blue" alt="Platforms">
   <img src="https://img.shields.io/badge/On--Device-MLX%20%7C%20Foundation%20Models-8B5CF6" alt="On-Device MLX + Foundation Models">