docs(process): document managed process workflows

README.md

@@ -10,7 +10,7 @@ one consistent API on Windows and Linux.
 - UTF-8 text, file-list, and RGBA image clipboard access
 - Native desktop notifications
 - Standard application, user, temporary, and executable paths
-- Non-blocking process launch
+- Managed and blocking processes with pipes, timeouts, and output capture
 - Move-only dynamic library handles with automatic cleanup
 - Environment variables and basic system information
 - Monotonic timing and sleeping
@@ -97,8 +97,18 @@ auto config = izo::GetKnownPath(izo::KnownPath::Config);
 izo::ProcessOptions process;
 process.executable = "tool";
 process.arguments = {"--input", "asset.png"};
-if (auto launched = izo::LaunchProcess(process)) {
-    // launched.processId identifies the new process.
+process.captureOutput = true;
+process.timeoutMs = 5000;
+const auto completed = izo::RunProcess(process);
+if (completed.exitCode == 0) {
+    // completed.stdoutText contains the tool output.
+}
+
+process.pipeStdin = true;
+if (auto running = izo::StartProcess(process)) {
+    running.WriteStdin("input");
+    running.CloseStdin();
+    running.Wait();
 }
 ```