Create biergarten brewery pipeline project (#199)

pipeline/includes/services/enrichment_service.h

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+#ifndef BIERGARTEN_PIPELINE_INCLUDES_SERVICES_ENRICHMENT_SERVICE_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_SERVICES_ENRICHMENT_SERVICE_H_
+
+/**
+ * @file services/enrichment_service.h
+ * @brief Abstraction for resolving contextual enrichment for a location.
+ */
+
+#include <string>
+
+#include "data_model/location.h"
+
+/**
+ * @brief Interface for services that can enrich a location with context.
+ */
+class IEnrichmentService {
+ public:
+  /// @brief Virtual destructor for polymorphic cleanup.
+  virtual ~IEnrichmentService() = default;
+
+  /**
+   * @brief Resolves contextual enrichment for a location.
+   *
+   * @param loc Location to enrich.
+   * @return Context text, or an empty string if unavailable.
+   */
+  virtual std::string GetLocationContext(const Location& loc) = 0;
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_SERVICES_ENRICHMENT_SERVICE_H_

pipeline/includes/services/wikipedia_service.h

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+#ifndef BIERGARTEN_PIPELINE_INCLUDES_SERVICES_WIKIPEDIA_SERVICE_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_SERVICES_WIKIPEDIA_SERVICE_H_
+
+/**
+ * @file services/wikipedia_service.h
+ * @brief Wikipedia summary retrieval service with in-memory caching.
+ */
+
+#include <memory>
+#include <string>
+#include <string_view>
+#include <unordered_map>
+
+#include "services/enrichment_service.h"
+#include "web_client/web_client.h"
+
+/// @brief Provides Wikipedia summary lookups backed by cached raw extracts.
+class WikipediaService final : public IEnrichmentService {
+ public:
+  /// @brief Creates a new Wikipedia service with the provided web client.
+  explicit WikipediaService(std::unique_ptr<WebClient> client);
+
+  /// @brief Returns the Wikipedia-derived context for a location.
+  [[nodiscard]] std::string GetLocationContext(const Location& loc) override;
+
+ private:
+  std::string FetchExtract(std::string_view query);
+  std::unique_ptr<WebClient> client_;
+  /// @brief Canonical cache for raw Wikipedia query extracts.
+  std::unordered_map<std::string, std::string> extract_cache_;
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_SERVICES_WIKIPEDIA_SERVICE_H_