skill v4.0.0-alpha.8: four visitor modes replace the brand/product bifurcation

Field report: impeccable SaaS-ified a developer docs page; the Opus
galleries showed the same on an album page. Root cause: two registers
force every surface into persuade-or-operate grammar. The register
section now names the visitor's mode first (Persuade / Operate / Read /
Experience) with mode-borrowing called out as the canonical failure,
and PRODUCT.md's register field maps as family (brand = Persuade +
Experience, product = Operate + Read) for compatibility. Read mode:
comprehension deliverable, navigable structure, chrome out of the way.
Experience mode: the artifact leads at every screen size.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/test-suites.mjs

@@ -124,6 +124,7 @@ export const SUITES = {
           'tests/live-browser-regression.test.mjs',
           'tests/live-browser-session.test.mjs',
           'tests/live-browser-source.test.mjs',
+          'tests/live-benchmark.test.mjs',
           'tests/live-commit-manual-edits.test.mjs',
           'tests/live-completion.test.mjs',
           'tests/live-copy-edit-agent.test.mjs',