Plugin `config` hook tasks are silently ignored by `vp run`

Describe the bug

When a Vite plugin adds run.tasks via the config hook, vp run does not recognize those tasks. Only tasks defined statically in vite.config.ts or in package.json scripts are visible.

Reproduction

https://github.com/user/vp-plugin-config-repro

Steps to reproduce

1. Create the project with the above files
2. Run pnpm install
3. Run vp run — observe that build:prod and build:dev are missing from the task list
4. Run vp run build:prod — observe Task "build:prod" not found.
5. For comparison, add a static run field to vite.config.ts (without plugin) and confirm vp run shows the tasks correctly

System Info

vp v0.1.14

Tools:
  vite             v8.0.2
  rolldown         v1.0.0-rc.11
  vitest           v4.1.1
  oxfmt            v0.42.0
  oxlint           v1.57.0
  oxlint-tsgolint  v0.17.3
  tsdown           v0.21.4

Environment:
  Package manager  pnpm v10.33.0
  Node.js          v24.14.1

Used Package Manager

pnpm

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.