[masarray]

P0-C typed MMS Read — exact P0-B descendant

Exact engine SHA: ba21d882f67de22c10d3155b449aac77aa8b4899; base P0-B PR #179 at d9e795275447ea1dcc3bea435b57f948595de310.

Root causes, non-vendor fixes

• BER primitive decoder previously mapped malformed empty/overwide Boolean, Integer and Unsigned to false/0; now returns Unknown with raw bytes, never a fabricated process scalar.
• Boolean exact width, invalid BitString and FloatingPoint width checks; valid zero, false, negative signed and UInt32 remain accepted.
• Single and ordered batch Read expose typed MmsReadEvidenceFailureKind mapped from actual MMS AccessResult codes: AccessDenied, NotSupported, TypeMismatch, ObjectMissing, TemporarilyUnavailable, RemoteAccessFailure, InvalidResponse or ProtocolRejected.
• Exact invoke ID enforced; batch wrong AccessResult cardinality quarantined entirely rather than publishing partial wrong-ordinal scalars.
• Synthetic BER regression covers valid zero/false, malformed primitives, mixed 4-result batch, wrong invocation, short/extra result lists.

Independent exact-SHA proof

• Windows engine CI SUCCESS.
• Windows ARSAS R7 cross-repo SUCCESS: 1178/1178 engine, 2371/2371 consumer.
• Corresponding consumer PR #627 pins this exact engine and maintains immutable P0-A/P0-B ancestry.

CODE VERIFIED / field evidence unresolved: historical SGCB 23 observed +12 read failed +45 deferred was missing actual invoke, GVA and accessResult detail. These 12 failures are not claimed solved on wire. No writes, fabricated values, forbidden polling or physical promotion.

[masarray]

Cleanup of verified stacked Git ancestry on 2026-10-22: original source SHA ba21d882f67de22c10d3155b449aac77aa8b4899 is fully contained (0 missing commits) in canonical consolidated draft #190, currently 14b19d30466fd296ad1e6d0bddcdd574992bc464; exact merged-tree Windows CI #39778971482 passed 1,262/1,262 tests with no build warning/error.

Closing this now as consolidated/superseded, NOT merged to main; no branch deletion, no source history loss, no ARSAS repin, no mainline engine source promotion. Original physical validation and follow-ups still apply, and #190 remains draft. If #190 is discarded, this PR is available to reopen.