[masarray]

M4-P0A — Three SCD-derived SV profiles on one common PTP sample grid (host foundation)

Implements the FIRST shippable coding slice of M4 ARD / #333.

This PR actually implements

• A reusable M4ThreeSvRosterCompiler in C++20; reuses the existing SCL model/compiler/device-profile binary compiler and keeps exactly three independently identified 4I+4V SV streams in one bounded host roster.
• Fail-all (atomic) compile: rejects absent family choice, unvalidated modulus, wrong stream count/rate/layout, unsupported device profile, duplicate full wire identity; allows APPID 0x4000 repeated on different multicast MACs as the owner's supplied SCD does.
• m4-three-9-2le-reference.scd with 3 IEDs, exact MAC/APPID/svID identity mapping, SCL 4000/s, 16 leaves per MU and explicit SmvOpts.
• New CTest verifies 3 compiled/roundtripped V1 binary stream records, unique MACs/svIDs and total 12,000 SV fps plus negative/error paths.
• No changes to M3.H.3 shipping firmware / release assets. This code is a host compiler, NOT live 3-stream firmware yet.

Follow-up PRs before user-visible M4

M4-P0B: V2 aggregate record/CRC and transactional 3-slot firmware staging. M4-P0C: single GPTimer/PTP-grid -> three preallocated TX contexts. M4-P0D: per-stream setpoints/readback. M4-P0E: one Studio with 3 synchronized Table/Waveform/Phasor pages. M4-P0F: paired firmware/Studio builds and bench testing.

Test gate

C++ CI: ariec61850_m4_three_sv_roster_tests and existing ariec61850_scl_tests. Merge only when C++ CI is green.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-25T10:23:29.208148Z	d05e15a	Draft marked ready

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: d05e15ab6c

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[chatgpt-codex-connector]

Reject duplicate IED conflicts before accepting the roster

When the SCD contains duplicate IED@name declarations with different control-block names, this compiler returns a successful roster despite the parser reporting an IED conflict. Reproduced by renaming the fixture's second IED to MU01_4I_4V_1 and its control/binding to MSVCB02: document.conflicts reports the duplicate IED, but compile().ok() is true. The pairwise control-reference check does not catch this, allowing profiles compiled from ambiguous IED/DataSet namespaces through the validation boundary. Preserve the deliberate repeated-APPID exception, but reject duplicate-IED conflicts before publishing the roster.

AGENTS.md reference: AGENTS.md:L152-L152

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