docs(test): document verification tiers

Document fast, focused browser, and full authority verification tiers plus the full local timeout/shard expectation.

req: test/015

req: test/016

req: test/004

req: test/006

REQUIREMENTS.md

@@ -859,6 +859,12 @@ what a valid business email is. [north_star]
 ### req: test/014
 0	014	html_examples browser smoke asserts dynamic interactions complete without full-page reload or navigation. [north_star]
 
+### req: test/015
+0	015	Verification docs distinguish fast, focused browser, and full tiers while preserving `cargo run -p hemx-xtask -- test` as the full local authority. [north_star]
+
+### req: test/016
+0	016	The full local verification path has an explicit timeout budget; any shard split is deterministic and preserves equivalent coverage. [north_star]
+
 ---
 
 ## check