0.0.86: pipeline hardening + unified macOS test stdlib + aarch64 cross gcc16 floor#203
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…(A1), cross gcc16 floor (A2/R5a) Version bump + remediation-doc live status. Ships on top of the merged PRs #201 (verified gated mirroring) and #202 (static libc++ for test binaries, llvm 22.1.8 green); this branch adds the aarch64 cross floor: <triple>-gcc@16.1.0 (xim entry #344), retiring GCC 15 from the cross path. The manifest instantiation anchor REMAINS for the x86_64 musl release build (musl-gcc 15.1.0) until R5b packages its gcc 16.
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Release train for the root-cause remediation set (design:
.agents/docs/2026-07-08-root-cause-remediation-design.md, live status table inside).Already merged into main and shipped by this release: #201 (A4 — verified, gated mirroring; blocking completeness gate; fresh-install index wait) and #202 (A1 — test binaries use the same static
-load_hiddenlibc++ as distributables; llvm 22.1.8 green after 8 forensics-driven CI rounds; macOS pin → 22.1.8, latest-first install restored).This PR adds:
prepare.cppmcross convention now resolves<triple>-gcc@16.1.0(packaged today via xlings-res builder workflows, xim entry pkg(aarch64-linux-musl-gcc): add 16.1.0 openxlings/xim-pkgindex#344). GCC 15's module-instantiation link bug leaves the cross path. Themanifest:typesinstantiation anchor REMAINS for the x86_64-linux-musl release build (musl-gcc 15.1.0) until R5b packages its gcc 16 — comment updated with the exit criterion.The cross-build CI job on this PR is the gcc-16 verification (fresh toolchain download + full static aarch64 link of mcpp itself).