dangernoodle-io / breadboard / 29454898104

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feat: add bb_serialize_console heap-over-serial backend with portable decimal formatting (#888)

- new bb_serialize_console component: a bb_serialize_emit_t backend
  registered as BB_FORMAT_CONSOLE that renders a snapshot as a single
  human-readable "key=val key=val" line, with snprintf-style
  truncation-on-overflow (always NUL-terminated, never an error)
- bb_serialize_console_heap_report(): one-shot heap-over-serial milestone
  report on top of bb_meminfo, no periodic task
- fix a real HW bug: emit_u64/emit_i64 formatted numbers via
  "%" PRIu64/PRId64 (== "%llu"/"%lld" on ESP32), which nano-newlib
  (CONFIG_NEWLIB_NANO_FORMAT=1) can't format -- every heap value printed
  as the literal "lu" on hardware. Extracted a portable, no-snprintf,
  no-locale decimal formatter (bb_num_u64_to_dec/bb_num_i64_to_dec) into
  bb_num per the Consolidation rule -- this was the SECOND hand-rolled
  instance of the idiom (bb_serialize_json already hand-rolled it) --
  and migrated both bb_serialize_console and bb_serialize_json onto it
  (JSON output byte-identical, host tests unchanged)
- add a host test proving bb_console_appendf's cap==0 guard is reachable
  via the public ctx_init+emit+walk path (not the unreachable branch its
  prior comment claimed) and drop the stale LCOV_EXCL_BR_LINE
- fence: approve the new_component baseline growth for bb_serialize_console


Claude-Session: https://claude.ai/code/session_01V5JXJNaYWPwjrcS8nk183m

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

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