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feat(config): config-coupling closeout — 13 DERIVE/ENFORCE/guard couplings (#618)

psram-axis derives (kconfig default chains):
- bb_event/Kconfig: BB_EVENT_MAX_PAYLOAD → default 1024 if SPIRAM, 512 (TA-517)
- bb_log/Kconfig: BB_LOG_EVENT_QUEUE_LEN → default 48 if SPIRAM, 24
- bb_net_health/Kconfig: BB_PUB_ADAPTIVE_RSSI_THRESH → default BB_NET_HEALTH_RSSI_MARGINAL_LO (single source of truth)

kconfig enforce — depends on:
- bb_pub/Kconfig: BB_PUB_BUFFER_ALWAYS → depends on BB_PUB_BUFFER_ENABLE && SPIRAM
- bb_update_check/Kconfig: BB_UPDATE_CHECK_AUTOREGISTER → depends on !BB_OTA_STRATEGY_BOOT

compile-time static_asserts (invariants that were only documented, now enforced):
- bb_event_common.c: BB_EVENT_MAX_PAYLOAD >= BB_PUB_TELEM_SERIALIZE_MAX (belt-and-suspenders, TA-517)
- bb_pub.c: BB_CACHE_MAX_TOPICS >= BB_PUB_MAX_SOURCES (each source registers a cache topic)
- bb_ota_pull.c: BB_OTA_PULL_HTTP_CHUNK_SIZE <= MBEDTLS_SSL_IN_CONTENT_LEN (chunk fits TLS record)
- bb_net_health.c: BB_NET_HEALTH_HEAP_CRITICAL_BYTES < BB_NET_HEALTH_HEAP_LOW_BYTES (ordering invariant)
- bb_ota_push.c: BB_OTA_PUSH_MAX_DURATION_S < BB_OTA_PUSH_WDT_EXTENDED_S (wdt outlasts push)
- bb_sink_http.c: BB_SINK_HTTP_HEADERS_BUF_BYTES >= HEADERS_MAX*(NAME_MAX+VALUE_MAX+4)
- bb_pub_espidf.c: BB_PUB_WORKER_STACK >= 8192 when any TLS gate is on
- bb_timer.c: BB_TIMER_DISP_CORE <= 0 on FREERTOS_UNICORE (core 1 doesn't exist)

guard — compile-time #error:
- bb_heap_arena.c: BB_HEAP_ARENA_BYTES > 0 requires MBEDTLS_CUSTOM_MEM_ALLOC=y (else wasted BSS)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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