Fixes#11042
- **Root cause**: When `enableGlobalVirtualStore` is true and `allowBuilds` is not configured, `createAllowBuildFunction()` returned `undefined`, causing all GVS hashes to include `ENGINE_NAME`. When `approve-builds` later configured `allowBuilds`, the hash didn't change because the engine was already included.
- **Fix**: Default `allowBuilds` to `{}` in GVS mode so hashes are engine-agnostic by default, and have `approve-builds` call `install.handler()` in GVS mode instead of the low-level `install()` function, so it properly handles workspaces and updates symlinks.
- **Refactor**: Broke circular dependencies between `building/commands`, `installing/commands`, and `global/commands` using dependency injection via a `commands` map passed as the third argument to command handlers. Added `CommandHandler` and `CommandHandlerMap` types to `@pnpm/cli.command`.
## Changes
### Architecture
- Command handlers now receive a `commands` map as an optional third argument `(opts, params, commands?)`
- The CLI dispatcher in `main.ts` passes the full commands map to every handler
- Handlers that need other commands (e.g., `globalAdd` needs `approve-builds`, `recursive` needs `rebuild`) access them from this map
- This replaces direct cross-package imports that would create circular dependencies
### Packages changed
- `@pnpm/cli.command` — new `CommandHandler` and `CommandHandlerMap` types
- `@pnpm/building.commands` — `approve-builds` uses `install.handler` for GVS
- `@pnpm/global.commands` — removed `building/commands` dependency; receives `approve-builds` via commands map
- `@pnpm/installing.commands` — receives `rebuild` via commands map instead of direct import
- `@pnpm/installing.deps-installer` / `@pnpm/installing.deps-restorer` — default `allowBuilds` to `{}` in GVS mode
- `pnpm` CLI — dispatcher passes commands map to all handlers
