chore: Add GitHub Actions CI, Dependabot, and build badge

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: GoodbyePlanet

.github/dependabot.yml

@@ -0,0 +1,14 @@
+version: 2
+updates:
+  - package-ecosystem: uv
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      dependencies:
+        patterns: ["*"]
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: astral-sh/setup-uv@v5
+
+      - name: Check formatting
+        run: uvx ruff format --check .
+
+      - name: Lint
+        run: uvx ruff check .
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+
+      - name: Install dependencies
+        run: uv sync --frozen --all-groups
+
+      - name: Run tests
+        run: uv run pytest --tb=short -q

README.md

@@ -1,6 +1,7 @@
 ![MCP Server](https://img.shields.io/badge/MCP-Server-blue)
 ![Python 3.12+](https://img.shields.io/badge/Python-3.12%2B-green)
 ![License MIT](https://img.shields.io/badge/License-MIT-yellow)
+[![CI](https://github.com/GoodbyePlanet/semcode/actions/workflows/ci.yml/badge.svg)](https://github.com/GoodbyePlanet/semcode/actions/workflows/ci.yml)
 
 # semcode