PowerShell-first install and provider-switching guidance was missing from the release-readiness path, so add a focused quickstart and link it from the primary docs without touching runtime code.
Constraint: G009 task 4 scope is docs-only install/release quickstart and provider switching; do not mutate .omx/ultragoal.
Rejected: Runtime or installer changes | task asks for command-copyable docs and source-of-truth alignment, not product behavior changes.
Confidence: high
Scope-risk: narrow
Directive: Keep Windows examples placeholder-secret only and prefer explicit provider model prefixes when multiple credentials may exist.
Tested: cargo fmt --check; cargo check --workspace; cargo clippy --workspace --no-deps; markdown link/fence/grep validation.
Not-tested: cargo test --workspace has pre-existing failing rusty-claude-cli::tests::session_lifecycle_prefers_running_process_over_idle_shell unrelated to docs; targeted rerun reproduces.
Co-authored-by: OmX <omx@oh-my-codex.dev>
G009 Stream 8 acceptance requires a Windows release artifact quickstart with checksum evidence, not just source-build docs. Add Windows release asset packaging and make the release-readiness check assert the workflow/docs contract.
Constraint: Stream 8 requires release artifact quickstart with checksums and no-credential smoke paths.
Rejected: Documenting a future Windows asset without workflow support | would leave acceptance unverifiable.
Confidence: high
Scope-risk: narrow
Tested: python3 .github/scripts/check_release_readiness.py; python3 .github/scripts/check_doc_source_of_truth.py; git diff --check
Not-tested: actual GitHub release workflow execution on windows-latest.
Co-authored-by: OmX <omx@oh-my-codex.dev>
