ArasanEmbedded 1.1.0

Highlights

• Harden Arasan's in-process lifecycle with ordered background output, serialized and restartable start/stop behavior, callback-safe blocking teardown, and one active engine per linked package copy.
• Prevent physical Apple devices from terminating during startup by running Arasan on an explicitly sized 4 MiB pthread stack and replacing upstream globals::initGlobals() in the embedded entry path with documented package-owned non-stack initialization.
• Add public ArasanSoakRunner.stop() support and substantially strengthen smoke, soak, timeout-recovery, command-validation, resource-validation, and regression coverage.

Updated

• Refresh vendored Arasan from c4bfcab0d5873cb5f61531426fad7a1b3abfe7f1 to upstream master commit c51273aa812c38bd54460adf68f2e15c32e74d71.
• Package the default Lichess-derived corpus with arasan-soak and add a complete offline release-validation gate.
• Make GitHub-hosted validation manual-only and optional; local validation remains the release evidence.

Compatibility

• No breaking public API changes were detected against v1.0.6; ArasanSoakRunner.stop() is additive.
• Runtime NNUE and Threads changes sent as raw UCI commands are now rejected. Create a newly configured engine to select a different NNUE network.
• Embedded searches intentionally remain fixed at one Arasan thread, and Apple arm64 remains the supported architecture.

Validation

• Complete clean-checkout Scripts/validate.sh gate: Debug and Release builds, the 55-test suite in normal and Thread Sanitizer modes, constrained-stack startup, CLI smoke and soak, simulator and generic-device builds, API compatibility, and committed-source archive/license verification.
• Optional downloaded Syzygy tablebase integration test passed separately.
• Physical iPad SwiftChessDemo validation with a disposable local package override: 111 Arasan-vs-Arasan plies and 79 mixed Stockfish/Arasan plies, with the app remaining alive and no engine failures.