[tmp] toolchain dialect + MinGW ecosystem — Windows CI iteration (0.0.89)#209

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Sunrisepeak wants to merge 8 commits into

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tmp/dialect-mingw-ci

Commits on Jul 13, 2026

refactor(toolchain): CommandDialect + backend surface normalization (Part A)
Sunrisepeak
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feat(toolchain): MinGW-w64 GCC via the xlings ecosystem (mingw@16.1.0) (0.0.89)
Sunrisepeak
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ci(temp): strip workflows except ci-windows + release (e2e 45 asserts release.yml)
Sunrisepeak
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fix(linkmodel): key the PE early-out on the target, not the host
Sunrisepeak
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fix(flags): MinGW links libstdc++exp for std::print terminal symbols
Sunrisepeak
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fix(flags): force winpthread static on MinGW links
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test(e2e): 97 asserts the exe import table (objdump) + diagnostic output
Sunrisepeak
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fix(flags): MinGW default links -static — the piecemeal winpthread recipe loses to driver implicit libs
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