fix(auto-slash-command): resolve project commands from session dir

Use the plugin session directory instead of process.cwd() when resolving project slash commands. This restores project and opencode-project slashcommand behavior when the runtime cwd differs from the actual session workspace.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/plugin/hooks/create-skill-hooks.ts

@@ -42,6 +42,7 @@ export function createSkillHooks(args: {
           skills: mergedSkills,
           pluginsEnabled: pluginConfig.claude_code?.plugins ?? true,
           enabledPluginsOverride: pluginConfig.claude_code?.plugins_override,
+          directory: ctx.directory,
         }))
     : null