dangernoodle-io / breadboard / 28414425150

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refactor(bb_mdns): shared bb_mdns_identity_t + shrink instance/hostname to 32 (B1-420) (#605)

- add bb_mdns_identity_t with instance_name[32]/hostname[32]/ip4[16]/port;
  embed in bb_mdns_peer_t and bb_mdns_query_result_t as .id
- add Kconfig BB_MDNS_INSTANCE_NAME_MAX/BB_MDNS_HOSTNAME_MAX (default 32, range 16..64)
  with Kconfig bridge in bb_mdns.h (CONFIG_BB_MDNS_* → macro → C default)
- shrink static buffers s_mdns_hostname/s_running_hostname/s_mdns_instance_name and
  bb_mdns_query_req_t.instance_name from 64 to the macro sizes
- fix bb_mdns_build_hostname: out[63]='\0' overflow → out[out_size-1]='\0'
- add bb_log_w truncation warnings in set_hostname, set_instance_name,
  fill_evt_from_result (instance_name + hostname), and bb_mdns_query_task
- update all .id. field accesses in dispatch_one, bb_mdns_query_task,
  fill_evt_from_result, bb_mdns_host.c coalesce shim, and all host tests


Claude-Session: https://claude.ai/code/session_018g7FuRUm7ugxYd1V1jPPUr

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

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