test(snapshot): migrate cwd-flag and app-root snap tests to the PTY harness

Moves the four old-harness fixtures added by this PR (command-cwd-flag,
command-app-root-listing, command-default-package,
command-default-package-missing) into crates/vite_cli_snapshots:

- cwd_flag: -C vs cd byte-identical for pack and run, missing-dir error,
  positional entry-semantics parity, with vpt list-dir/rm assertions
- app_root_listing: non-TTY dev listing joins the build step
- app_root_default_package: dist assertion plus a missing-directory case
  via a nested non-workspace root

Real pass/fail assertions and recorded exit codes replace the
regenerate-and-diff model for these cases.

Author: fengmk2

crates/vite_cli_snapshots/tests/cli_snapshots/fixtures/app_root_default_package/missing/package.json

@@ -0,0 +1 @@
+{ "name": "missing-default", "private": true }

…d-default-package-missing/vite.config.ts …t_default_package/missing/vite.config.tspackages/cli/snap-tests/command-default-package-missing/vite.config.ts renamed to crates/vite_cli_snapshots/tests/cli_snapshots/fixtures/app_root_default_package/missing/vite.config.ts packages/cli/snap-tests/command-default-package-missing/vite.config.ts renamed to crates/vite_cli_snapshots/tests/cli_snapshots/fixtures/app_root_default_package/missing/vite.config.ts

@@ -6,4 +6,13 @@ defaultPackage in the root config acts as an implicit -C for bare app
 commands, including at a root that is not a JS workspace; vp prints a note
 line and runs in the configured directory (rfcs/cwd-flag.md).
 """
-steps = [["vp", "pack"]]
+steps = [
+  ["vp", "pack"],
+  { argv = ["vpt", "list-dir", "packages/ui/dist"], comment = "output lands in the configured package" },
+]
+
+[[case]]
+name = "default_package_missing"
+vp = ["local", "global"]
+comment = "defaultPackage pointing at a missing directory errors before any workspace lookup."
+steps = [{ argv = ["vp", "build"], cwd = "missing" }]

crates/vite_cli_snapshots/tests/cli_snapshots/fixtures/app_root_default_package/snapshots.toml

@@ -16,3 +16,11 @@ note: vp pack: using ./packages/ui (defaultPackage)
 ℹ 1 files, total: 0.10 kB
 ✔ Build complete in <duration>
 ```
+
+## `vpt list-dir packages/ui/dist`
+
+output lands in the configured package
+
+```
+index.mjs
+```

crates/vite_cli_snapshots/tests/cli_snapshots/fixtures/app_root_default_package/snapshots/default_package.global.md

@@ -14,3 +14,11 @@ note: vp pack: using ./packages/ui (defaultPackage)
 ℹ 1 files, total: 0.10 kB
 ✔ Build complete in <duration>
 ```
+
+## `vpt list-dir packages/ui/dist`
+
+output lands in the configured package
+
+```
+index.mjs
+```

crates/vite_cli_snapshots/tests/cli_snapshots/fixtures/app_root_default_package/snapshots/default_package.local.md

@@ -0,0 +1,13 @@
+# default_package_missing
+
+defaultPackage pointing at a missing directory errors before any workspace lookup.
+
+## `cd missing && vp build`
+
+**Exit code:** 1
+
+```
+VITE+ - The Unified Toolchain for the Web
+
+error: defaultPackage points to a missing directory: ./packages/nope
+```

crates/vite_cli_snapshots/tests/cli_snapshots/fixtures/app_root_default_package/snapshots/default_package_missing.global.md

@@ -0,0 +1,11 @@
+# default_package_missing
+
+defaultPackage pointing at a missing directory errors before any workspace lookup.
+
+## `cd missing && vp build`
+
+**Exit code:** 1
+
+```
+error: defaultPackage points to a missing directory: ./packages/nope
+```

crates/vite_cli_snapshots/tests/cli_snapshots/fixtures/app_root_default_package/snapshots/default_package_missing.local.md

@@ -6,7 +6,10 @@ A bare app command at a workspace root without an interactive terminal prints
 the ranked package listing with -C hints and exits 1 instead of building the
 root (rfcs/cwd-flag.md).
 """
-steps = [{ argv = ["vp", "build"], tty = false }]
+steps = [
+  { argv = ["vp", "build"], tty = false },
+  { argv = ["vp", "dev"], tty = false, comment = "dev at the root no longer starts a server against the root" },
+]
 
 [[case]]
 name = "picker_select"

crates/vite_cli_snapshots/tests/cli_snapshots/fixtures/app_root_listing/snapshots.toml

@@ -19,3 +19,21 @@ root (rfcs/cwd-flag.md).
   Pass a directory:  vp -C apps/admin build
   Or run every package's build script:  vp run -r build
 ```
+
+## `vp dev`
+
+dev at the root no longer starts a server against the root
+
+**Exit code:** 1
+
+```
+error: `vp dev` at the workspace root needs a target package.
+
+  Packages in this workspace:
+    admin  apps/admin
+    web    apps/web
+    ui     packages/ui
+
+  Pass a directory:  vp -C apps/admin dev
+  Or run every package's dev script:  vp run -r dev
+```

crates/vite_cli_snapshots/tests/cli_snapshots/fixtures/app_root_listing/snapshots/listing.global.md

@@ -19,3 +19,21 @@ root (rfcs/cwd-flag.md).
   Pass a directory:  vp -C apps/admin build
   Or run every package's build script:  vp run -r build
 ```
+
+## `vp dev`
+
+dev at the root no longer starts a server against the root
+
+**Exit code:** 1
+
+```
+error: `vp dev` at the workspace root needs a target package.
+
+  Packages in this workspace:
+    admin  apps/admin
+    web    apps/web
+    ui     packages/ui
+
+  Pass a directory:  vp -C apps/admin dev
+  Or run every package's dev script:  vp run -r dev
+```