chore: remove playground dead dep on playbooks, update description

playground's devDependency on @openagentpack/playbooks had zero imports
in its source tree. Remove it.

Also update the playbooks package description now that the session
runtime orchestration no longer lives there.

Change-Id: Ic6ac9936561f2186da6b2cdd37d8ffd0121402d3
Co-developed-by: OpenCode <noreply@opencode.ai>

Author: heimanba

bun.lock

@@ -3,7 +3,7 @@
 	"version": "0.0.1",
 	"private": true,
 	"license": "Apache-2.0",
-	"description": "OpenAgentPack shared playbook protocol, seed catalog, and runtime resolver",
+	"description": "OpenAgentPack shared playbook protocol, seed catalog, and resolvers",
 	"type": "module",
 	"exports": {
 		".": {

packages/playbooks/package.json

@@ -48,7 +48,6 @@
 	},
 	"devDependencies": {
 		"@types/bun": "^1.3.14",
-		"@openagentpack/playbooks": "workspace:*",
 		"@openagentpack/server": "workspace:*",
 		"@types/node": "^25.9.3",
 		"tsup": "^8.5.1",