Add FocasDriverMediumFindingsTests.cs with regression coverage for the
five Medium findings:
- 003: InitializeAsync throws when tag's DeviceHostAddress is absent
from Devices (two variants: typo host, wrong port; also happy path)
- 004: DiscoverAsync emits ViewOnly for tags with Writable:true
- 005: GetHealth() is consistent after ten concurrent ReadAsync calls
- 006: Read recovers after the client is externally disposed, creating
a fresh client rather than wedging with BadCommunicationError
- 012: Factory full-round-trip with all three opt-in config sections
(FixedTree + AlarmProjection + HandleRecycle) with all subfields
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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