test: add e2e test for bare directory name as explicit input

Verifies that inputs: ["src"] (a directory, not a glob) fingerprints
nothing — file changes inside and folder deletion are both cache hits.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: branchseer

crates/vite_task_bin/tests/e2e_snapshots/fixtures/inputs-cache-test/snapshots.toml

@@ -200,3 +200,20 @@ steps = [
   # Run task without auto inference - should see (undefined)
   "vp run check-fspy-env-without-auto",
 ]
+
+# 8. Folder path as input: inputs: ["src"]
+# - A bare directory name matches nothing (directories are not files)
+# - File changes inside the folder should NOT trigger cache invalidation
+[[e2e]]
+name = "folder input - hit despite file changes and folder deletion"
+steps = [
+  "vp run folder-input",
+  # Modify a file inside the folder
+  "replace-file-content src/main.ts initial modified",
+  # Cache hit: "src" matches the directory itself, not files inside it
+  "vp run folder-input",
+  # Delete the entire folder
+  "rm -rf src",
+  # Cache hit: folder removal doesn't affect fingerprint
+  "vp run folder-input",
+]

crates/vite_task_bin/tests/e2e_snapshots/fixtures/inputs-cache-test/snapshots/folder input - hit despite file changes and folder deletion.snap

@@ -0,0 +1,23 @@
+---
+source: crates/vite_task_bin/tests/e2e_snapshots/main.rs
+expression: e2e_outputs
+---
+> vp run folder-input
+$ print-file src/main.ts
+export const main = 'initial';
+> replace-file-content src/main.ts initial modified
+
+> vp run folder-input
+$ print-file src/main.ts ✓ cache hit, replaying
+export const main = 'initial';
+
+---
+[vp run] cache hit, <duration> saved.
+> rm -rf src
+
+> vp run folder-input
+$ print-file src/main.ts ✓ cache hit, replaying
+export const main = 'initial';
+
+---
+[vp run] cache hit, <duration> saved.

crates/vite_task_bin/tests/e2e_snapshots/fixtures/inputs-cache-test/vite-task.json

@@ -44,6 +44,11 @@
       "command": "print-env FSPY",
       "inputs": ["src/**/*.ts"],
       "cache": true
+    },
+    "folder-input": {
+      "command": "print-file src/main.ts",
+      "inputs": ["src"],
+      "cache": true
     }
   }
 }