`vp pack --watch`: changes to pack config are not applied until restart

Start by running vp pack --watch and changing pack.minify in vite.config.ts to observe the reload path. Trace how the watcher detects configuration changes and compare it with the stated tsdown --watch behavior. Done means changed pack options are applied on the next build without restarting the watcher.

Describe the bug

Changed options are not applied while the watcher is running.

tsdown --watch does not have that issue.

Reproduction

Too basic, no particularly specific repro needed. See steps to reproduce below.

Steps to reproduce

1. Run vp pack --watch
2. Change something in vite.config.ts

• for example, change pack: { minify: false } to pack: { minify: true }

3. Saving vite.config.ts will trigger a build, but the new options will not be applied

System Info

> vp env current   
VITE+ - The Unified Toolchain for the Web

Node.js:
  Version    26.10.0
  Source     devEngines.runtime
  Bin Path   C:\Users\me\AppData\Local\vite-plus\data\js_runtime\node\26.10.0\node.exe
  Installed  true
  Mode       managed

Package Manager:
  Name       npm
  Version    12.1.0
  Source     devEngines.packageManager
  Bin Paths  
    npm      C:\Users\me\AppData\Local\vite-plus\data\package_manager\npm\12.1.0\npm\bin\npm.cmd
    npx      C:\Users\me\AppData\Local\vite-plus\data\package_manager\npm\12.1.0\npm\bin\npx.cmd
  Installed  true
  Mode       managed

> vp --version
VITE+ - The Unified Toolchain for the Web

vp v1.0.0-rc.0

Local vite-plus:
  vite-plus  v1.0.0-rc.0

Tools:
  vite             v8.3.0
  rolldown         v1.2.9
  vitest           v5.0.1
  oxfmt            v0.70.0
  oxlint           v1.85.0
  oxlint-tsgolint  v7.0.2002
  tsdown           v0.23.0

Environment:
  Package manager  npm ^12.0.0
  Node.js          v26.10.0 (devEngines.runtime)

Used Package Manager

npm

Logs

Validations

• Read the Contributing Guidelines.
• Check that there isn't already an issue for the same bug.
• Confirm this is a Vite+ issue and not an upstream issue (Vite, Vitest, tsdown, Rolldown, or Oxc).
• The provided reproduction is a minimal reproducible example.