Step 7.2: HLS client fetches live segments (log only)

- main/hls: task active while source.mode is hls/auto and hls_url is
  set. esp_http_client over HTTPS (IDF certificate bundle), redirects
  followed (max 5), streamed reads in 4 KB chunks to a sink callback.
- Master playlist: highest BANDWIDTH variant; URL resolution for
  absolute, host-relative and path-relative references; CRLF tolerant.
- Media playlist: TARGETDURATION, MEDIA-SEQUENCE, segments; start 3
  segments behind the live edge, fetch each new one in order, skip ahead
  if the window moved past us, reload after target/2 when nothing is new.
- Verified with Triple J Hottest (ABC, Akamai): 252 kbit/s AAC-LC
  variant chosen, 3 back-fill segments then one new ~10 s segment at a
  time, ~303 KB in ~1.25 s each; heap 439 KB, PSRAM 31.9 MB free.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

main/player.c

@@ -7,6 +7,7 @@
 #include "aes67_tx.h"
 #include "aes67_web.h"
 #include "audio_ring.h"
+#include "hls.h"
 #include "esp_log.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
@@ -112,5 +113,9 @@ esp_err_t player_init(void)
     player_apply(src);
     cJSON_Delete(src);
     xTaskCreate(test_producer, "test_prod", 3072, NULL, 5, NULL);
+    err = hls_start(NULL);  // 7.2: fetch and log only; decoding in 7.3
+    if (err != ESP_OK) {
+        return err;
+    }
     return status_register(player_status);
 }