Fix holden plugin source to use git-subdir for subdirectory support

feat: add holden plugin, remove 8 superseded agent plugins

feat: bundle dependencies into agent plugins

registry: add prose-style plugin to marketplace.json

feat: prose-style plugin — longform writing output style with interlocutor mode

feat: add 8 agent plugins to marketplace

vault-aware-style: replace verbatim skill dispatch duplication with structural reminder

Add vault-aware-style plugin

thinking-partner v1.0.0: ablation-optimized additionalContext

Modified by www.SourceFiles.app

Initial plugin: thinking-partner output style