fix(config): auto-install hooks when called from postinstall lifecycle

Projects like npmx.dev call `vp config` from `postinstall` instead of
`prepare`. Extend the lifecycle detection to also recognize `postinstall`
so hooks are auto-installed without prompting in both cases.

Closes #1154

Author: fengmk2

packages/cli/snap-tests-global/command-config-auto-hooks/snap.txt

@@ -11,7 +11,6 @@ import { defineConfig } from 'vite-plus';
 
 export default defineConfig({
   staged: {
-    "*": "vp check --fix"
+    '*': 'vp check --fix',
   },
-
 });

packages/cli/snap-tests-global/command-config-postinstall-auto-hooks/package.json

@@ -0,0 +1,3 @@
+{
+  "name": "command-config-postinstall-auto-hooks"
+}

packages/cli/snap-tests-global/command-config-postinstall-auto-hooks/snap.txt

@@ -0,0 +1,17 @@
+> git init
+> vp config # should install hooks automatically without prompting
+> git config --local core.hooksPath # should be .vite-hooks/_
+.vite-hooks/_
+
+> cat .vite-hooks/pre-commit # should have vp staged
+vp staged
+
+> cat vite.config.ts # should have staged config
+import { defineConfig } from 'vite-plus';
+
+export default defineConfig({
+  staged: {
+    "*": "vp check --fix"
+  },
+  
+});

packages/cli/snap-tests-global/command-config-postinstall-auto-hooks/steps.json

@@ -0,0 +1,12 @@
+{
+  "env": {
+    "npm_lifecycle_event": "postinstall"
+  },
+  "commands": [
+    { "command": "git init", "ignoreOutput": true },
+    "vp config # should install hooks automatically without prompting",
+    "git config --local core.hooksPath # should be .vite-hooks/_",
+    "cat .vite-hooks/pre-commit # should have vp staged",
+    "cat vite.config.ts # should have staged config"
+  ]
+}

packages/cli/src/config/bin.ts

@@ -54,7 +54,8 @@ async function main() {
   const dir = args['hooks-dir'] as string | undefined;
   const hooksOnly = args['hooks-only'] as boolean;
   const interactive = defaultInteractive();
-  const isPrepareScript = process.env.npm_lifecycle_event === 'prepare';
+  const lifecycleEvent = process.env.npm_lifecycle_event;
+  const isLifecycleScript = lifecycleEvent === 'prepare' || lifecycleEvent === 'postinstall';
   const root = process.cwd();
 
   // --- Step 1: Hooks setup ---
@@ -66,11 +67,11 @@ async function main() {
     interactive &&
     isFirstHooksRun &&
     !dir &&
-    !isPrepareScript &&
+    !isLifecycleScript &&
     !hasStagedConfigInViteConfig(root)
   ) {
     // --hooks-dir implies agreement; only prompt when using default dir on first run
-    // prepare script implies the project opted into hooks — install automatically
+    // lifecycle script (prepare/postinstall) implies the project opted into hooks — install automatically
     // existing staged config in vite.config.ts implies the project already opted in
     shouldSetupHooks = await promptGitHooks({ interactive });
   }

rfcs/config-and-staged-commands.md

@@ -296,7 +296,7 @@ vp config
 │   • Interactive terminal (not CI, not piped)
 │   • First run (hook shims don't exist yet)
 │   • No --hooks-dir flag
-│   • Not running from prepare lifecycle
+│   • Not running from lifecycle script (prepare/postinstall)
 │   • No staged config in vite.config.ts          ← NEW (#1154)
 │
 │   YES → Prompt "Set up pre-commit hooks?"
@@ -317,7 +317,7 @@ vp config
 
 | Caller                                | Prompts? | Why                                              |
 | ------------------------------------- | -------- | ------------------------------------------------ |
-| `npm install` → prepare               | No       | prepare lifecycle = auto-install                 |
+| `npm install` → prepare/postinstall   | No       | lifecycle script = auto-install                  |
 | Manual, project has `staged` config   | No       | staged config = already opted in **(#1154 fix)** |
 | Manual, no `staged` config, first run | **Yes**  | No signal that project wants hooks               |
 | Manual, already ran before            | No       | Hook shims exist = not first run                 |