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Commits on Aug 17, 2026

  1. docs: cxx_runtime was inert on MSVC until 2026.8.16, and upgrading is… 

    … silent

The MSVC section describes today's behaviour correctly and says nothing about
the fact that it is NEW. Through 2026.8.15 the key reported "not implemented
for the MSVC runtime yet" and every value fell back to /MD; since 2026.8.16
(#422) it selects the CRT model.

So a manifest carrying `cxx_runtime = "self-contained"` from that era switches
from /MD to /MT on upgrade — silently, because the value was always spelled
correctly and always accepted. /MT is a different CRT model rather than a
stricter version of the same one.

Not hypothetical: found while reviewing xrgui's mcpp manifest, which carried
exactly that value, set at a time when it did nothing, with a comment
explaining that it was a no-op.
    @speak-agent
    speak-agent committed Aug 17, 2026
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