feat(tui): add path-only @file autocomplete

docs/config-catalog.md

@@ -1556,7 +1556,7 @@ export interface Config extends TuiConfig {
   resumeCommand?: string
 }
 
-/** Presentation settings for the pi-tui terminal mode. */
+/** Interaction and presentation settings for the pi-tui terminal mode. */
 export interface TuiConfig {
   /** Render model reasoning blocks. */
   showReasoning?: boolean
@@ -1574,6 +1574,12 @@ export interface TuiConfig {
   modelDialogWidth?: number
   /** Model-selector maximum height in terminal rows. */
   modelDialogMaxHeight?: number
+  /** Maximum fuzzy file candidates displayed for one `@` query. */
+  fileSearchMaxResults?: number
+  /** Maximum paths retained in one `@` workspace index. */
+  fileSearchMaxEntries?: number
+  /** Directory basenames excluded from `@` traversal and completion. */
+  fileSearchExcludedDirectories?: string[]
   /** Show the terminal's hardware cursor at the pi editor's IME marker. */
   showHardwareCursor?: boolean
   /** Apply the built-in ANSI color palette. */
@@ -1590,7 +1596,7 @@ export interface TuiConfig {
 }
 ```
 
-Source: [`packages/ui/tui/src/index.ts:216`](../packages/ui/tui/src/index.ts)
+Source: [`packages/ui/tui/src/index.ts:245`](../packages/ui/tui/src/index.ts)
 
 ## `@deepseek-ai/dsh-tui-demo`