PR CI acceleration, SPEC-009, and the repairs of #756 and #757 - #759

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feat/pr-ci-acceleration

Commits on Oct 1, 2026

docs: the PR CI acceleration and toolchain specification design record
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29ac96e
docs(specs): SPEC-009, the support and maintenance of toolchains
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f402012
ci: one build of mcpp per host, stages in one workflow, single-writer caches, timed shards and a coverage check
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2268c15
tests: fixture paths that the documentation structure check does not read as chapters
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68c6a6d
ci: use-built-mcpp installs the toolchain the build used, after setting the mirror
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118aa91

Commits on Oct 2, 2026