Summary

• archive the usability-polish active goal and add the lane closeout plus learning record
• record the implemented README, installed CLI, facade-example, external-smoke, and downstream-policy surfaces
• remove no-panic new debt found by the closeout gate by converting recently landed tests to Result-returning assertions

Validation

• cargo xtask external-adoption-smoke --path . --format json
• cargo xtask adoption-regression --external
• cargo xtask claim-report --check-public-claims
• cargo xtask contract-packs --check
• cargo xtask check-no-panic-family
• cargo xtask docs-sync --check
• cargo xtask typos
• cargo +nightly xtask pr-lite
• cargo xtask pr
• cargo fmt --all -- --check
• cargo test -p uselesskey-cli --all-features audit_bundle
• cargo test -p uselesskey-core sink
• cargo test -p uselesskey-webauthn --lib
• cargo test -p xtask
• git diff --check

Boundaries

• no release prep, version bump, tag, or publish
• no new contract pack, badges, provider compatibility claim, production security claim, broad policy DSL, shipper work, or dependency churn