feat(cache): add output file archiving and restoration

Archives output files after a successful run and restores them on cache hit. Defaults to automatically tracking files the task writes; accepts globs (e.g. `"dist/**"`), `{ "auto": true }`, and negative patterns (`"!dist/cache/**"`).

Squashed rebase of #321 onto main after the spawn decompose refactor and wincode migration.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: branchseer

CHANGELOG.md

@@ -1,5 +1,6 @@
 # Changelog
 
+- **Added** `output` field for cached tasks: archives output files after a successful run and restores them on cache hit. Defaults to automatically tracking files the task writes; accepts globs (e.g. `"dist/**"`), `{ "auto": true }`, and negative patterns (`"!dist/cache/**"`) ([#321](https://github.com/voidzero-dev/vite-task/pull/321))
 - **Changed** Arguments passed after a task name (e.g. `vp run test some-filter`) are now forwarded only to that task. Tasks pulled in via `dependsOn` no longer receive them ([#324](https://github.com/voidzero-dev/vite-task/issues/324))
 - **Fixed** Windows file access tracking no longer panics when a task touches malformed paths that cannot be represented as workspace-relative inputs ([#330](https://github.com/voidzero-dev/vite-task/pull/330))
 - **Fixed** `vp run --cache` now supports running without a task specifier and opens the interactive task selector, matching bare `vp run` behavior ([#312](https://github.com/voidzero-dev/vite-task/pull/313))