review(p9-fb-25-task1): fix kebab-app test references to removed WorkspaceCfg.include

reviewer-flagged: task 1 missed test files using cfg.workspace.include.

- crates/kebab-app/tests/common/mod.rs: SourceScope literal switched
  to ..Default::default().
- crates/kebab-app/tests/image_pipeline.rs (×3): drop dead-no-op
  cfg.workspace.include.push(...) calls; comment explains removal.
- crates/kebab-app/tests/pdf_pipeline.rs: same treatment.

Pre-fb-25 these pushes were no-ops (include was dead config field
not enforced anywhere). Removal is purely mechanical.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/kebab-app/tests/common/mod.rs

@@ -75,8 +75,8 @@ impl TestEnv {
     pub fn scope(&self) -> kebab_core::SourceScope {
         kebab_core::SourceScope {
             root: self.workspace_root.clone(),
-            include: self.config.workspace.include.clone(),
             exclude: self.config.workspace.exclude.clone(),
+            ..Default::default()
         }
     }
 }