refactor: make v0.1.0 a CLI-only release

[danielsuit]

Summary

• remove the Harbor adapter, Python package, tests, docs, CI job, and release wheel
• make bare sc securely prompt for and save the API key on first launch
• keep headless benchmark output harness-neutral and document direct CLI invocation
• simplify v0.1.0 release publishing to signed Linux CLI binaries only

Verification

• cargo fmt --all -- --check
• cargo clippy --locked --workspace --all-targets -- -D warnings
• cargo test --locked --workspace
• cargo clippy --locked --manifest-path integrations/dlr/Cargo.toml --workspace --all-targets -- -D warnings
• cargo test --locked --manifest-path integrations/dlr/Cargo.toml --workspace
• Rust 1.89 checks for both workspaces
• python3 scripts/check-release-version.py --tag v0.1.0
• sc --help smoke test
• verified no Harbor references or directory remain in the working tree

The repository remains private. The v0.1.0 tag should be created only after this PR is reviewed and merged.