Throw InvalidOperationException at InitializeAsync when a tag's
DeviceHostAddress does not match any entry in the Devices list, naming
both the tag and the unresolved host. Previously the missing-device
check was guarded by a TryGetValue so a typo silently bypassed
capability-matrix validation and deferred the error to per-read
BadNodeIdUnknown — the opposite of the documented "fail at load" goal.
Also resolves findings 004, 005, and 006 in the same file:
- 004: DiscoverAsync now unconditionally emits ViewOnly for all user
tags; the Writable config field no longer influences security class
because the wire backend always returns BadNotWritable.
- 005: All _health reads use Volatile.Read and all writes use
Volatile.Write so concurrent readers observe a consistent reference
and read-modify-write sequences capture a stable snapshot.
- 006: EnsureConnectedAsync disposes and nulls any existing
non-connected client before creating a fresh one, preventing
ObjectDisposedException loops after a HandleRecycle race or teardown.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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