Add --write-private-only flag#6

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tlongwell-block wants to merge 3 commits intotoolset_ro_rwfrom

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Commits on Mar 1, 2026

feat: add GITHUB_WRITE_PRIVATE_ONLY env var to restrict writes to private repos
tlongwell-block
committed
fix: add explicit BindEnv for GITHUB_WRITE_PRIVATE_ONLY env var
tlongwell-block
committed
test: add getClient failure test and integration wiring test
tlongwell-block
committed