dangernoodle-io / TaipanMiner / 27804457266

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fix(telemetry): size bb_pub store-and-forward ring per board to stop per-tick eviction (#543)

the always-on ring (BB_PUB_BUFFER_ALWAYS=y) enqueues every active source each
tick and drains after the loop, so MAX_ENTRIES must hold a full tick or the
first-enqueued sources are evicted before the drain. the previous fleet-wide
MAX_ENTRIES=4 was smaller than the bitaxe per-tick source count (~8, all HALs
present), silently dropping wifi/thermal/rtos/power telemetry every tick
(buffer_dropped climbed in steady state). sw boards (~5 sources) just fit.

- raise the no-PSRAM default to 8 (holds ~5 sources + headroom)
- override PSRAM bitaxe boards (403/601/650) to 16 in SPIRAM, completing the
  "PSRAM boards override to a larger ring" note that was documented but never
  implemented

breadboard-side hardening for the underlying footgun (silent overflow + an
undersize guard) tracked in B1-298.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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