v9.0.0

• standalone assertions (assert.js works without runner)
• pluggable output formats (formats object)
• test.mute() — suppress output unless failure
• test.demo() — run without affecting exit code
• per-test timeout option
• TAP output format (TST_FORMAT=tap)
• config via env vars / URL params
• fix errors display in red with stack trace
• fix assertion numbers reset per test
• fix auto-run handles slow imports
• fix state encapsulation (no global mutation)

Full Changelog: v8.0.2...v9.0.0