dangernoodle-io / breadboard / 27528127104

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feat(config): expose telemetry tunables as Kconfig knobs + fix bb_sink_http header buffer (telemetry review) (#447)

- CONFIG_BB_SINK_HTTP_MAX_CONSEC_FAILURES (bb_sink_http, default 3, range 1-20): replaces hardcoded consecutive-failure → session_close threshold
- CONFIG_BB_SINK_HTTP_HEADERS_BUF_BYTES (bb_sink_http, default 2596): fixes silent NVS header truncation — computed as HEADERS_MAX*(NAME_MAX+VALUE_MAX+4)+4; old 2048 was smaller than the max headers set (2592); no-fallback `#ifndef` guard covers Arduino/host builds
- CONFIG_BB_HTTP_CLIENT_BACKOFF_BASE_MS (bb_http_client, default 2000, range 100-30000) + CONFIG_BB_HTTP_CLIENT_BACKOFF_MAX_MS (default 8000, range 500-120000): replaces hardcoded `{2000,4000,8000}` ladder; derived as base*2^attempt capped at max
- CONFIG_BB_HTTP_CLIENT_STREAM_CHUNK_BYTES (bb_http_client, default 2048, range 256-8192): replaces hardcoded `chunk_buf[2048]`
- CONFIG_BB_HTTP_CLIENT_DEFAULT_BUF_SIZE (bb_http_client, default 4096, range 512-16384): replaces hardcoded 4096 fallback across all four call sites in bb_http_client_espidf.c
- CONFIG_BB_PUB_WORKER_PRIORITY (bb_pub, default 1, range 1-24): replaces hardcoded xTaskCreate prio 1; critical for miner boards where mining loop runs at high priority
- CONFIG_BB_PUB_MAX_PAYLOAD_EXTENDERS (bb_pub, default 4, range 1-16): replaces `#ifndef BB_PUB_MAX_PAYLOAD_EXTENDERS` fallback with real Kconfig
- CONFIG_BB_PUB_SUBTOPIC_MAX (bb_pub, default 64, range 16-128): replaces hardcoded subtopic[64] in source struct and tick topic buf
- CONFIG_BB_PUB_BUFFER_TOPIC_MAX (bb_pub, default 192, range 64-512, depends on BB_PUB_BUFFER_ENABLE): replaces hardcoded `#define BB_PUB_BUFFER_TOPIC_MAX 192`
- CONFIG_BB_UPDATE_CHECK_JITTER_S (bb_update_check, default 600, range 0-3600): replaces hardcoded ±10-min jitter
- CONFIG_BB_UPDATE_CHECK_FLOOR_S (bb_update_check, default 60, range 10-300): replaces hardcoded 60 s floor
- CONFIG_BB_UPDATE_CHECK_TASK_CORE (bb_update_check, default 1, range 0-1... (continued)

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