Add fixture files for fetcher

crates/fetcher/fixtures/checksums.json

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+{
+  "content.txt": "3dc7bc0209231cc61cb7d09c2efdfdf7aacb1f0b098db150780e980fa10d6b7a",
+  "content.tar.gz": "aa7d1aae79175b06c5529409d65f4794479c9b060381e059a8b6d1510fa2ae48"
+}

crates/fetcher/justfile

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+
+# Create content.tar.gz from content.txt and generate checksums
+fixtures:
+    ./scripts/generate-fixtures.sh

crates/fetcher/scripts/generate-fixtures.sh

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+#!/bin/bash
+set -e
+
+# Navigate to the fetcher directory
+cd "$(dirname "$0")/.."
+
+echo "Creating content.tar.gz from content.txt..."
+tar -czf fixtures/content.tar.gz -C fixtures content.txt
+
+echo "Generating checksums..."
+
+# Calculate SHA256 hashes
+content_hash=$(shasum -a 256 fixtures/content.txt | cut -d' ' -f1)
+archive_hash=$(shasum -a 256 fixtures/content.tar.gz | cut -d' ' -f1)
+
+# Create JSON file with checksums
+cat > fixtures/checksums.json <<EOF
+{
+  "content.txt": "${content_hash}",
+  "content.tar.gz": "${archive_hash}"
+}
+EOF
+
+echo "✓ Created fixtures/content.tar.gz"
+echo "✓ Created fixtures/checksums.json"
+echo ""
+echo "Checksums:"
+echo "  content.txt:     ${content_hash}"
+echo "  content.tar.gz:  ${archive_hash}"