vibe code the initial impl

main/config_store.h

@@ -0,0 +1,26 @@
+#pragma once
+#include <stddef.h>
+#include <stdint.h>
+#include "esp_err.h"
+
+// All runtime-tunable parameters in one struct. Defaults come from Kconfig, the
+// saved copy (NVS) wins when present and layout-compatible.
+typedef struct {
+    float    threshold;      // cosine similarity needed for a frame to "match"
+    float    min_rms;        // loudness gate (int16 RMS); quieter frames never match
+    uint32_t win_n;          // sliding window length (frames), 1..32
+    uint32_t win_m;          // matches needed inside the window, 1..win_n
+    uint32_t cooldown_ms;    // quiet period after an alert
+    float    noise_mult;     // learn/adapt gate = noise floor * this
+    float    adapt_weight;   // weight of the NEW template in `adapt` (0..1)
+    uint32_t monitor_ms;     // min interval between `monitor` lines
+    uint32_t heartbeat_h;    // heartbeat period in hours, 0 = off
+} app_config_t;
+
+esp_err_t config_init(void);              // nvs_flash_init + load
+void config_get(app_config_t *out);       // thread-safe copy
+esp_err_t config_set_param(const char *name, const char *value, char *err, size_t err_len);
+esp_err_t config_reset_defaults(void);
+int config_param_count(void);
+const char *config_param_name(int i);
+void config_param_format(int i, char *buf, size_t len);   // "0.800  (range 0.1..0.999)  help"