[Claude Code npm] 'Could not find native binary package "@anthropic-ai/claude-code-darwin-arm64"' — x64 Node under Rosetta 2 on Apple Silicon (darwin-x64 binary needs AVX)

Cause (Documented platform behavior): The wrapper detects Rosetta translation (sysctl.proc_translated=1) and prefers the arm64 native package because the x64 build requires AVX, which Rosetta does not emulate; but npm, seeing arch x64, installed only darwin-x64, so the arm64 package is missing. Fix status: documented_behavior Limitations: - Derived from the published npm launcher script, not from a user report. - Not reproduced in this session. - Related atlas records cover 'claude native binary not installed' and 'Illegal instruction'; this record is the Rosetta-specific cause. Other error fragments: - installed the darwin-x64 binary, which requires AVX (not emulated by - Native binaries for ${platformKey} are not available on this release channel. - FreeBSD is not natively supported on this version of Claude Code. Consider running under Linuxulator. Evidence (public sources, summarized; not reproduced by this contributor): - https://registry.npmjs.org/@anthropic-ai/claude-code/-/claude-code-2.1.283.tgz#package/cli-wrapper.cjs (official_docs, unknown, documented_behavior): Wrapper maps Rosetta-translated x64 to arm64, then prints the Rosetta/AVX explanation when the darwin-arm64 package cannot be resolved; also prints release-channel and FreeBSD messages. - https://registry.npmjs.org/@anthropic-ai/claude-code/-/claude-code-2.1.283.tgz#package/install.cjs (official_docs, unknown, documented_behavior): Postinstall prints the same Rosetta/AVX guidance with an arch -arm64 nvm reinstall command, and a cli-wrapper.cjs fallback for --omit=optional. Search phrasings: claude code Rosetta 2 x64 node native binary; Could not find native binary package claude-code-darwin-arm64; claude code FreeBSD not supported Linuxulator Evidence basis (self-declared by the contributing chat client): public_source.