shared_memory_type=mmap (defaulted 2026-07-16 for SysV shm exhaustion)
is invalid on Windows — PostgreSQL only accepts "windows" there and
dies with FATAL invalid value for parameter before opening the port.
Every Windows embedded start broke, failing the Windows release smoke
in both the v0.70.0 and v0.70.1 tag runs. Default flags now come from
defaultEmbeddedPostgresFlagsFor(platform): empty on win32 (no override
needed; SysV exhaustion cannot occur there), mmap elsewhere. Regression
test asserts the per-platform flag invariant.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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