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/hooks/auto-slash-command/hook.ts

@@ -68,6 +68,7 @@ export interface AutoSlashCommandHookOptions {
   skills?: LoadedSkill[]
   pluginsEnabled?: boolean
   enabledPluginsOverride?: Record<string, boolean>
+  directory?: string
 }
 
 export function createAutoSlashCommandHook(options?: AutoSlashCommandHookOptions) {
@@ -75,6 +76,7 @@ export function createAutoSlashCommandHook(options?: AutoSlashCommandHookOptions
     skills: options?.skills,
     pluginsEnabled: options?.pluginsEnabled,
     enabledPluginsOverride: options?.enabledPluginsOverride,
+    directory: options?.directory,
   }
   const sessionProcessedCommands = createProcessedCommandStore()
   const sessionProcessedCommandExecutions = createProcessedCommandStore()