dangernoodle-io / breadboard / 30423276465

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feat: add periodic console report of per-task stack high-water marks (#1130)

Mirrors bb_serialize_console_heap_report()'s gather -> descriptor ->
bb_serialize_console_render() -> bb_log_i() shape, one line per task
(the console backend is flat/scalar-only, so an array of task rows
cannot render as a single nested line).

Reads bb_task_base_foreach() rather than sampling FreeRTOS a third
time: the periodic base-scan already computes each task's stack
high-water free bytes via bb_num_words_to_bytes() (B1-1128), but
previously discarded that value after its low-stack check. Adds
bb_task_base_set_free_bytes() to persist it onto the base entry as the
SSOT this report (and any future consumer) reads.

Wired into examples/floor on its own periodic timer (not heap's) since
the underlying data only changes once per base-scan pass, and starts
bb_task_registry_base_scan_start() so the scan actually runs there.

Unblocks B1-1247 (BB_WIFI_PROV_TASK_STACK is an unmeasured guess) and
B1-1077 (confirm bb_diag stack headroom on device) by making per-task
stack headroom observable over serial with no HTTP client needed --
today the only route is GET /api/diag/tasks, unreachable on the
SoftAP in practice (iOS disassociates ~4s after the captive-internet
probe).

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