Add GOOSE subscriber supervision and publisher runtime

[masarray]

Scope

Phase 1C adds deterministic GOOSE runtime behavior:

Subscriber supervision

• TTL deadline and one-shot expiry events.
• First, retransmission, duplicate, sequence-gap/regression, state-change/jump/regression classification.
• stNum and sqNum 32-bit wraparound handling.
• Control-block, dataset, and configuration-revision identity checks.
• Arrival-gap statistics and AllData-change validation.

Publisher runtime

• Initial, retransmission, and state-change counter semantics.
• stNum increment and sqNum = 0 on state changes.
• Exponential retransmission scheduling and reset on state change.
• Stable state timestamp across retransmissions.
• Deterministic poll(now) without sleeping threads.

Validation

The branch was rebuilt as one clean Phase 1C commit on top of merged main; the full GCC, Clang, and Windows MSVC matrix will run again before merge.

Safety boundary

Returns encoded Ethernet-frame bytes only. No Npcap, raw sockets, or network-interface access.

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