Add project files (part 1/2)

Co-Authored-By: Claude Sonnet 5 <[email protected]>

injector/inject.hpp

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+// Process discovery and library injection, with no opinion about the UI.
+#pragma once
+
+#include <functional>
+#include <string>
+#include <vector>
+
+namespace Injector {
+
+struct Process {
+    unsigned long pid = 0;
+    std::string   name;
+    std::string   command_line;
+};
+
+using LogFn = std::function<void(const std::string &)>;
+
+std::vector<Process> ListProcesses();
+
+// Finds the running Minecraft JVM.  On Linux that is a java process whose
+// command line names the game; on Windows it is the LWJGL/GLFW window's owner.
+bool FindMinecraft(Process &out, std::string &error);
+
+// Finds a process by pid, exact name, or case-insensitive substring of the
+// name/command line.  Accepts a decimal pid in `target`.
+bool FindTarget(const std::string &target, Process &out, std::string &error);
+
+// Loads `library` into `pid` through ptrace+dlopen (Linux) or
+// CreateRemoteThread+LoadLibraryW (Windows).  Returns false on failure.
+bool Inject(unsigned long pid, const std::string &library, const LogFn &log);
+
+// Why injection may fail before it starts, for the error message.
+std::string EnvironmentHint();
+
+}  // namespace Injector