Add browser-interactive-testing skill and fix Biome/audit config

Integrate the rodney/showboat browser automation skill for headless
Chrome screenshots and testing. Exclude .rodney and .agent-tests
from Biome file scanning. Add picomatch override to resolve
high-severity ReDoS vulnerability in knip/jscpd transitive deps.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

biome.json

@@ -8,7 +8,9 @@
 			"!.specify",
 			"!specs",
 			"!coverage",
-			"!.pnpm-store"
+			"!.pnpm-store",
+			"!.rodney",
+			"!.agent-tests"
 		]
 	},
 	"assist": {