N1: the m2 precedence trusted region/address whenever the keys were present,
but the AdminUI model stamps defaulted HoldingRegisters/0 on every save, so a
string-only tag (CSV import, or any editor toggle) silently became HR[0] -
reads AND writes. The resolved keys are now authoritative only when the editor
marked them ("addressResolved": true, written by Resolve); an unmarked
addressString is always resolved through the parser with the driver's family.
The model no longer stamps address fields for a string-only tag, CSV export
leaves its address cells blank, and the editor hint distinguishes string-only
from pinned tags. Tests: CSV import and editor save of a string-only tag, a
stamped-default blob, and the pinned positive control across families.
n1: docs/v2/modbus-addressing.md updated (FC23 opt-in, maxReadGap semantics,
coalescing scope, addressString/family rules, coil coercion, refusals).
n2: form round-trip tests for UseFC23ForMultiRegisterWrites /
DisableReadCoalescing. n4: the editor keeps unresolved address text when the
parent echoes back its own emit. n3: noted, no change.
Refs #741
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
Joseph Doherty
3531834cce