dangernoodle-io / breadboard / 27145913287

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fix(bb_diag): scrub non-UTF8 bytes from captured panic_reason (#369)

- root cause: task-watchdog panic_reason strings can contain raw
  non-printable/non-utf8 bytes from partial coredump task-name fields
  (observed: 0x9e 0xcb on tdongle-s3), causing strict json clients to
  reject GET /api/diag/panic responses
- fix: add pure host-testable bb_diag_scrub_text() that replaces bytes
  outside { \t \n \r 0x20..0x7e } with '?'; called immediately after
  esp_core_dump_get_panic_reason() succeeds and defensively on task_name;
  devices with already-stored garbage self-heal on their next panic/reboot

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

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