fix: merge synthetic task's input config in inherited cache path

When a synthetic task (e.g., vp pack, vp build) runs inside a parent
script task, the parent's cache config is inherited. Previously, only
env and untracked_env were merged from the synthetic — the input config
was silently dropped, causing negative glob exclusions to be ignored.

Now the synthetic's input globs are resolved relative to the workspace
root and merged into the parent's input_config. This allows callers to
pass negative globs (e.g., !node_modules/.vite-temp/**) that correctly
exclude paths from fspy tracking.

Closes voidzero-dev/vite-plus#1095

Author: fengmk2

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-negative-input-glob/build.mjs

@@ -0,0 +1,18 @@
+// Simulates Vite's behavior during build:
+// 1. Reads the source file (tracked as input by fspy)
+// 2. Writes a temp config to node_modules/.vite-temp/ (also tracked by fspy)
+// Without the negative input glob, step 2 causes a read-write overlap
+// that prevents caching.
+
+import { readFileSync, writeFileSync, mkdirSync } from 'node:fs';
+
+// Read source (tracked as input)
+const source = readFileSync('src/index.ts', 'utf-8');
+
+// Simulate Vite writing temp config (read-write to .vite-temp)
+const tempDir = 'node_modules/.vite-temp';
+mkdirSync(tempDir, { recursive: true });
+const tempFile = `${tempDir}/vite.config.ts.timestamp-${Date.now()}.mjs`;
+writeFileSync(tempFile, `// compiled config\nexport default {};`);
+
+console.log(`built: ${source.trim()}`);

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-negative-input-glob/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "cache-negative-input-glob",
+  "private": true
+}

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-negative-input-glob/snapshots.toml

@@ -0,0 +1,18 @@
+# Tests that negative input globs exclude paths from fspy tracking,
+# so tasks writing to excluded paths (like node_modules/.vite-temp) are still cached.
+# See: https://github.com/voidzero-dev/vite-plus/issues/1095
+
+[[e2e]]
+name = "negative input glob excludes vite-temp from tracking"
+steps = [
+  "vt run build # first run: cache miss",
+  "vt run build # second run: should hit cache despite .vite-temp write",
+]
+
+[[e2e]]
+name = "source change still causes cache miss with negative input glob"
+steps = [
+  "vt run build # first run: cache miss",
+  "replace-file-content src/index.ts world universe # modify real source",
+  "vt run build # cache miss: source changed",
+]

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-negative-input-glob/snapshots/negative input glob excludes vite-temp from tracking.snap

@@ -0,0 +1,13 @@
+---
+source: crates/vite_task_bin/tests/e2e_snapshots/main.rs
+expression: e2e_outputs
+---
+> vt run build # first run: cache miss
+$ node build.mjs
+built: export const hello = 'world';
+> vt run build # second run: should hit cache despite .vite-temp write
+$ node build.mjs ◉ cache hit, replaying
+built: export const hello = 'world';
+
+---
+vt run: cache hit, <duration> saved.

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-negative-input-glob/snapshots/source change still causes cache miss with negative input glob.snap

@@ -0,0 +1,12 @@
+---
+source: crates/vite_task_bin/tests/e2e_snapshots/main.rs
+expression: e2e_outputs
+---
+> vt run build # first run: cache miss
+$ node build.mjs
+built: export const hello = 'world';
+> replace-file-content src/index.ts world universe # modify real source
+
+> vt run build # cache miss: source changed
+$ node build.mjs ○ cache miss: 'src/index.ts' modified, executing
+built: export const hello = 'universe';

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-negative-input-glob/src/index.ts

@@ -0,0 +1 @@
+export const hello = 'world';

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-negative-input-glob/vite-task.json

@@ -0,0 +1,10 @@
+{
+  "cache": true,
+  "tasks": {
+    "build": {
+      "command": "node build.mjs",
+      "cache": true,
+      "input": [{ "auto": true }, "!node_modules/.vite-temp/**"]
+    }
+  }
+}

crates/vite_task_plan/src/plan.rs

@@ -20,7 +20,7 @@ use vite_str::Str;
 use vite_task_graph::{
     TaskNodeIndex, TaskSource,
     config::{
-        CacheConfig, ResolvedGlobalCacheConfig, ResolvedTaskOptions,
+        CacheConfig, ResolvedGlobalCacheConfig, ResolvedInputConfig, ResolvedTaskOptions,
         user::{UserCacheConfig, UserTaskOptions},
     },
     query::TaskQuery,
@@ -464,6 +464,24 @@ fn resolve_synthetic_cache_config(
                     if let Some(extra_pts) = enabled_cache_config.untracked_env {
                         parent_config.env_config.untracked_env.extend(extra_pts);
                     }
+                    // Merge synthetic's input config (resolve relative to workspace root,
+                    // since synthetic commands operate at CLI level, not package level)
+                    if let Some(ref input) = enabled_cache_config.input {
+                        let synthetic_input = ResolvedInputConfig::from_user_config(
+                            Some(input),
+                            workspace_path,
+                            workspace_path,
+                        )
+                        .map_err(Error::ResolveTaskConfig)?;
+                        parent_config
+                            .input_config
+                            .negative_globs
+                            .extend(synthetic_input.negative_globs);
+                        parent_config
+                            .input_config
+                            .positive_globs
+                            .extend(synthetic_input.positive_globs);
+                    }
                     Some(parent_config)
                 }
             })