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* fix(tests): pass Windows base system env to isolated pytest child
The live-test policy regression tests spawn a pytest child with a minimal,
from-scratch env. On Windows that env lacks SystemRoot/TEMP/USERPROFILE, so
the child dies during import asyncio (WinError 10106, winsock provider init)
and tempfile cannot resolve a directory, making the tests fail for
environment reasons instead of testing the opt-in policy.
Extract the env assembly into _child_pytest_env() and pass through a small
allowlist of Windows base system variables (SystemRoot, windir, COMSPEC,
PATHEXT, TEMP, TMP, USERPROFILE) when present. These carry no credentials,
so the isolation contract (no API keys, no real .env) is unchanged, and
POSIX behavior is byte-identical. A new unit test pins the contract: only
the allowlisted base vars may pass through, and SystemRoot must be present
on Windows.
* test(live-policy): seed Windows base env vars in the bootability contract
The contract test asserted TEMP/TMP pass-through without seeding them, so
on Windows hosts that do not export those optional variables (CPython then
falls back to %USERPROFILE%\AppData\Local\Temp) it failed on host
configuration rather than on the helper's contract.
Seed the representative base variables with monkeypatch and assert the
forwarded set exactly, so the isolation contract is deterministic on every
host. Red/green evidence: with TEMP/TMP stripped from the environment the
old assertion fails (extra = {COMSPEC, PATHEXT, SystemRoot, USERPROFILE,
windir}) while the seeded assertion passes.
Addresses the P3 finding in the review of PR #6439.
* ci(tests): cover Windows live-test policy
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>