Fix CI policy and Linux test build

[jdpraveen]

Summary

• remove the third-party MSVC environment action rejected by the organization Actions policy
• include <algorithm> explicitly for std::find in streaming tests

Why

The CI workflow could not create jobs because the organization allows only GitHub-owned or verified actions. The CodeQL build also exposed that tests_streaming.cpp relied on a transitive <algorithm> include that GCC does not provide.

Verification

• ./build.sh --clean --test --debug-only --auto — 428/428 tests passed
• actionlint .github/workflows/*.yml
• reuse lint
• git diff --check

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