Task: Fix missing official plugin acquire and download action

Identity

Task ID: 20260905-plugin-download-action-6c8e4a21
Mode: Feature
Branch: codex/20260905-plugin-download-action-6c8e4a21-plugin-download-action
Worktree: D:\Datas\OthersProjects.codex-worktrees\makelore\20260905-plugin-download-action-6c8e4a21
Base commit: 9ed9bf4a71
Owner: codex-root
Status: Ready for Integration

Reproduce and fix the unified /plugins projection for the code-owned bundled makelore.project-scaffold Plugin when the Account Library has not acquired it.
Keep the existing acquisition, device-package, project-enablement, and Agent assignment authorities separate; cover the public Renderer seam with a focused regression test.
Limit product changes to the unified Plugin workspace projection/presentation and its focused tests unless the reproduction proves the fault is owned elsewhere.

A bundled Project Scaffold Plugin never has a device download/update/uninstall action. Before acquisition it must offer the existing free Account Library acquire action; after acquisition it may offer project enablement and Agent assignment.
Do not add a visible local package/Skill installation picker, change server/Main contracts, or collapse Account Library acquisition into device installation.
Preserve the occupied client root worktree and its three adopted untracked task records exactly. Work only in this isolated feature worktree.
Concurrent Task Gate: Passed. Planning Gate: Passed after loading the current integrated state, ADR-008, Plugin business rules/module boundaries, and the completed root Project Scaffold integration task. No active product writer overlaps this scope.

Added one shared projection predicate for code-owned bundled official Plugins and used it on both the unified Plugin card and detail dialog. An unacquired bundled Project Scaffold now reports 随应用提供 rather than the false 未下载官方包 state.
Preserved the existing authority boundary: the client does not synthesize a Marketplace catalog entry or acquisition action. The existing 免费获取 action still appears only when the server catalog contains the Plugin and the authenticated Account Library snapshot confirms it is not acquired.

TDD red: the new public Renderer regression failed because both card and detail reported the bundled Plugin as not downloaded.
Focused green: plugins-page plus plugin-workspace-model = 35 passed.
corepack pnpm run typecheck: passed.
Scoped ESLint on the three changed product files and focused test: passed.
corepack pnpm run build:vite: passed for Renderer, Main, Preload, and utility targets with existing size/import warnings.
Full unit run: 225 files / 1887 passed / 2 skipped, with one unrelated real-process timing threshold failure (2657ms < 2000ms). The exact failed file then passed 6/6 in isolation; the separately skipped pressure suite passed 1/1.
git diff --check: passed.

Deploy the current Works Square server revision and migrate production through 20260904_project_scaffold_0085; until then the live catalog has no authority to offer 免费获取 for makelore.project-scaffold.