Implement infinite Git HTTP server

This server generates a new commit every time someone pulls from it.
Features:
- Pure Go implementation of Git object format and protocols
- No dependency on git CLI commands
- Thread-safe commit generation
- Read-only Git HTTP smart protocol support
- Comprehensive test suite

Each pull creates a new commit with a unique file containing a timestamp
and counter, making the repository grow infinitely with each pull operation.

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

test.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+set -e
+
+# Cleanup function
+cleanup() {
+    echo "Cleaning up..."
+    if [ -n "$SERVER_PID" ]; then
+        kill $SERVER_PID 2>/dev/null || true
+    fi
+}
+
+# Trap EXIT to ensure cleanup happens
+trap cleanup EXIT
+
+echo "Starting infinite-git server..."
+go run . -addr :9876 -repo /tmp/test-infinite-git &
+SERVER_PID=$!
+
+# Give server time to start
+sleep 2
+
+# Create test directory
+TEST_DIR=$(mktemp -d)
+cd "$TEST_DIR"
+
+echo "Cloning repository..."
+git clone http://localhost:9876 test-repo
+cd test-repo
+
+echo "Initial clone complete. Files:"
+ls -la
+
+echo "Pulling again..."
+git pull
+
+echo "Files after first pull:"
+ls -la
+
+echo "Pulling once more..."
+git pull
+
+echo "Files after second pull:"
+ls -la
+
+echo "Checking commits..."
+git log --oneline
+
+# Test directory cleanup
+cd /
+rm -rf "$TEST_DIR"
+
+echo "Test complete!"