P1: enable independent multi-IED FAT connections

[masarray]

P1 scope

Enable true independent multi-IED connection/monitoring in the IO FAT workspace while deliberately keeping FAT evidence journaling single-active per IED.

What changes

• remove the FAT window's global _preparingIed lock; preparation state now belongs to each IoTestIedPlan;
• add a compact Connect/Prepare/Refresh action for the currently selected IED, while explorer selection stays available during other IED connection workflows;
• allow IED B to start preparation while IED A is still connecting/monitoring;
• drive card progress solely from each IED's own IsPreparing state;
• add BindIed(...) and use target-scoped live binding throughout FAT preparation so one IED cannot clear or rewrite another IED's binding state at await boundaries;
• allow connection preparation to receive an explicit point scope, so continuation connection can focus on unfinished evidence without mutating another IED's plan;
• keep IoTestSessionController intentionally single-active and device-filtered so transitions cannot enter the wrong evidence journal.

Safety invariants

• no process control commands are introduced;
• each engineering/runtime connection remains per-device;
• parallelism applies to connection/discovery/report monitoring, not evidence journal ownership;
• ambiguous signal matching from P0 remains fail-closed;
• existing continuation evidence protection remains in place.

Regression coverage

Adds IoFatMultiIedConnectionRegressionTests for target-scoped binding isolation, per-IED preparation/action state, source-contract checks for parallel connection UX, and preservation of single-active/device-filtered evidence capture.

Please gate merge on focused IO tests, full ARSAS regression tests, portable publish, and smoke test.

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