Give the interpreter real Celtic Cross meanings and --format/--lang support

- guidance.c now prints last, after the full spread; both it and main.c's
  new Celtic Cross readout pull real Waite card meanings via tarot_data.c
  instead of just naming cards.
- interpreter-cli gains --format text|html|json and --lang en|de, matching
  deck-engine - required linking engine/src/tarot_data.c and i18n.c into
  the interpreter binary (a narrow, documented exception to its earlier
  "no engine .c files" policy) and writing German translations for
  narrative.c's/guidance.c's own text.

interpreter/tests/json_test.c

@@ -41,11 +41,11 @@ static void test_json_parse_rejects_malformed(void) {
 }
 
 /* A trimmed-but-structurally-faithful fixture matching deck-engine's real
- * --format json shape: "spread" is present with decoy content the loader
- * must skip over without understanding its schema, to prove it navigates
- * by key path rather than assuming any position. "natal"/"transits"
- * bodies are real (if partial) - reading_load_json now parses sign/house
- * from them for display, alongside the aspects used for scoring. */
+ * --format json shape. "natal"/"transits" bodies are real (if partial) -
+ * reading_load_json parses sign/house from them for display, alongside
+ * the aspects used for scoring. "spread" only fills in the Attitude and
+ * Outcome positions (the two guidance.c reads); the other eight are
+ * absent entirely, to prove partial spread data doesn't fail the load. */
 static const char *k_fixture =
   "{"
   "  \"natal\": {\"bodies\": [{\"body\": \"sun\", \"sign\": \"taurus\", \"house\": 3}], \"houses\": []},"
@@ -57,7 +57,10 @@ static const char *k_fixture =
   "      {\"transiting_planet\": \"saturn\", \"natal_planet\": \"sun\", \"type\": \"square\", \"orb\": 0.5}"
   "    ]"
   "  },"
-  "  \"spread\": {\"positions\": [{\"position\": \"present\", \"card\": \"devil\", \"reversed\": false}]}"
+  "  \"spread\": {\"positions\": ["
+  "    {\"position\": \"attitude\", \"card\": \"devil\", \"reversed\": true},"
+  "    {\"position\": \"outcome\", \"card\": \"world\", \"reversed\": false}"
+  "  ]}"
   "}";
 
 static void test_reading_load_json_extracts_aspects(void) {
@@ -95,6 +98,35 @@ static void test_reading_load_json_extracts_body_sign_and_house(void) {
   printf("PASS test_reading_load_json_extracts_body_sign_and_house\n");
 }
 
+static void test_reading_load_json_extracts_spread_positions(void) {
+  DailyReading reading;
+  bool ok = reading_load_json(k_fixture, strlen(k_fixture), &reading);
+
+  assert(ok);
+  assert(reading.spread.positions[POSITION_ATTITUDE].card == CARD_DEVIL);
+  assert(reading.spread.positions[POSITION_ATTITUDE].reversed == true);
+  assert(reading.spread.positions[POSITION_OUTCOME].card == CARD_WORLD);
+  assert(reading.spread.positions[POSITION_OUTCOME].reversed == false);
+
+  /* Positions absent from the fixture (e.g. Present) get the zeroed
+   * default (CARD_FOOL, upright) rather than garbage. */
+  assert(reading.spread.positions[POSITION_PRESENT].card == CARD_FOOL);
+  assert(reading.spread.positions[POSITION_PRESENT].reversed == false);
+
+  printf("PASS test_reading_load_json_extracts_spread_positions\n");
+}
+
+static void test_reading_load_json_missing_spread_is_not_fatal(void) {
+  const char *text = "{\"transits\": {\"aspects\": []}}";
+  DailyReading reading;
+  bool ok = reading_load_json(text, strlen(text), &reading);
+
+  assert(ok);
+  assert(reading.spread.positions[POSITION_OUTCOME].card == CARD_FOOL);
+
+  printf("PASS test_reading_load_json_missing_spread_is_not_fatal\n");
+}
+
 static void test_reading_load_json_unknown_body_slug_is_skipped_not_fatal(void) {
   const char *text =
     "{\"natal\": {\"bodies\": [{\"body\": \"xenu\", \"sign\": \"taurus\", \"house\": 3}]},"
@@ -147,6 +179,8 @@ int main(void) {
   test_json_parse_rejects_malformed();
   test_reading_load_json_extracts_aspects();
   test_reading_load_json_extracts_body_sign_and_house();
+  test_reading_load_json_extracts_spread_positions();
+  test_reading_load_json_missing_spread_is_not_fatal();
   test_reading_load_json_unknown_body_slug_is_skipped_not_fatal();
   test_reading_load_json_empty_aspects_is_valid();
   test_reading_load_json_rejects_missing_transits();