feat(pki): add typed CLI operation foundation

Add a reusable PKI session and typed synchronous operation executor
shared by direct CLI commands and versioned sequential batch plans.

Provide deterministic references, structured output, failure policies and
safe lifecycle handling without introducing a scripting language or runtime.

app/src/main/java/zeroecho/pki/cli/PkiCliConfiguration.java

@@ -0,0 +1,114 @@
+/*******************************************************************************
+ * Copyright (C) 2026, Leo Galambos
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this software must
+ *    display the following acknowledgement:
+ *    This product includes software developed by the Egothor project.
+ *
+ * 4. Neither the name of the copyright holder nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ ******************************************************************************/
+package zeroecho.pki.cli;
+
+import java.nio.file.Path;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Set;
+
+import zeroecho.pki.application.PkiOperationValue;
+import zeroecho.pki.application.PkiSessionConfiguration;
+import zeroecho.pki.spi.ProviderConfig;
+
+/** Strict versioned CLI configuration loader. */
+final class PkiCliConfiguration {
+
+    private static final Set<String> ROOT_FIELDS = Set.of("version", "store", "audit");
+    private static final Set<String> PROVIDER_FIELDS = Set.of("provider", "properties");
+    private static final String STDOUT_PROVIDER = "stdout";
+
+    private PkiCliConfiguration() {
+    }
+
+    /* default */ static PkiSessionConfiguration read(Path path) throws java.io.IOException {
+        byte[] document = PkiCliFiles.readRegularFile(path, PkiCliJson.MAXIMUM_DOCUMENT_BYTES);
+        PkiOperationValue.ObjectValue root = object(PkiCliJson.parse(document));
+        requireExactFields(root.fields(), ROOT_FIELDS);
+        int version = Math.toIntExact(integer(required(root, "version")));
+        ProviderConfig store = provider(required(root, "store"));
+        ProviderConfig audit = provider(required(root, "audit"));
+        if (STDOUT_PROVIDER.equals(audit.backendId())) {
+            throw new IllegalArgumentException("CLI audit provider must not write to standard output");
+        }
+        return new PkiSessionConfiguration(version, store, audit);
+    }
+
+    private static ProviderConfig provider(PkiOperationValue value) {
+        PkiOperationValue.ObjectValue object = object(value);
+        requireExactFields(object.fields(), PROVIDER_FIELDS);
+        String provider = text(required(object, "provider"));
+        PkiOperationValue.ObjectValue properties = object(required(object, "properties"));
+        Map<String, String> result = new LinkedHashMap<>();
+        for (Map.Entry<String, PkiOperationValue> entry : properties.fields().entrySet()) {
+            result.put(entry.getKey(), text(entry.getValue()));
+        }
+        return new ProviderConfig(provider, result);
+    }
+
+    /* default */ static PkiOperationValue required(PkiOperationValue.ObjectValue object, String name) {
+        PkiOperationValue value = object.fields().get(name);
+        if (value == null) {
+            throw new IllegalArgumentException("Required CLI field is missing");
+        }
+        return value;
+    }
+
+    /* default */ static PkiOperationValue.ObjectValue object(PkiOperationValue value) {
+        if (value instanceof PkiOperationValue.ObjectValue object) {
+            return object;
+        }
+        throw new IllegalArgumentException("CLI field has the wrong type");
+    }
+
+    /* default */ static String text(PkiOperationValue value) {
+        if (value instanceof PkiOperationValue.Text text) {
+            return text.value();
+        }
+        throw new IllegalArgumentException("CLI field has the wrong type");
+    }
+
+    /* default */ static long integer(PkiOperationValue value) {
+        if (value instanceof PkiOperationValue.IntegerValue integer) {
+            return integer.value();
+        }
+        throw new IllegalArgumentException("CLI field has the wrong type");
+    }
+
+    /* default */ static void requireExactFields(Map<String, PkiOperationValue> actual, Set<String> expected) {
+        if (!actual.keySet().equals(expected)) {
+            throw new IllegalArgumentException("CLI document fields are invalid");
+        }
+    }
+}