fix: show empty work preview without invoking the Agent

.project-docs/30-worklog/tasks/20260929-empty-work-preview-9c3f72a1.md

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+# Task: Show a local empty state without invoking the Agent when no work exists
+
+## Identity
+
+- Task ID: 20260929-empty-work-preview-9c3f72a1
+- Mode: Feature
+- Branch: codex/20260929-empty-work-preview-9c3f72a1-empty-work-preview
+- Worktree: /Users/chillishark/Makelore 麦洛/.codex-worktrees/makelore/20260929-empty-work-preview-9c3f72a1
+- Base commit: 077184aabac89783a67913e964a32ed0f519b6d6
+- Owner: codex
+- Status: Ready for Integration
+
+## Scope
+
+- Show a deterministic local empty state when the project has no work to preview, before creating an operation conversation or sending OPEN_WORK_PROMPT. Preserve preview restoration, existing-work startup, busy waiting and failure recovery.
+
+## Intent And Constraints
+
+- User approved implementation after read-only evaluation. Empty copy: “还没有作品，快和老师聊聊吧”. No Yuxi quick-prompt implementation, cloud publication, model calls, app replacement or main-branch merge is included in this change.
+- Concurrent and Planning Gates passed. App worktree tool reported the parent workspace is not a Git repository; used the skill isolation fallback at main 077184a. Matching task reservation/worktree owner verified.
+- Read AGENTS, entry/memory/planning gate, active task, positioning, integrated state, decisions, architecture, domain, success criteria, evidence and relevant scaffold/teacher decisions. Peer scopes reviewed; teacher-help-label/release and child-language-skill are active (the latter scope undefined), with no concrete dependency. Completed teacher presence owns historical preview behavior; this user's explicit request authorizes the no-work exception. Canonical memory partly predates current README/code and remains read-only.
+- Plan: add a bounded conservative Main-owned work-presence check; return an empty result before conversation creation/submission; render exact local copy; verify real filesystem absence/asset-only and existing-work paths, UI and existing preview lifecycle; update README and this record.
+
+## Outcome
+
+- Implemented a Main-owned bounded names/types scan before any conversation creation or internal prompt submission. New/metadata/knowledge/material-only projects return `empty`; unknown formats, unreadable directories, links and scan bounds retain the existing startup path. Known reachable pages still bypass the scan. Presence is rechecked after reopening and is not cached as a terminal attempt.
+- Added the `empty` preview result and exact local copy “还没有作品，快和老师聊聊吧”. No model call, added chat message, recovery button, technical error or background polling for the empty state; retained return-to-operation-chat action. A later host show event rechecks the same request so newly opened work appears without tab/focus changes.
+- Existing work startup, busy-project waiting, known-page restoration, failure recovery and uncertain-request deduplication are preserved. README synchronized. No cloud configuration, installed app, live project data or main branch changed.
+
+## Verification
+
+- `corepack pnpm` verified at the repository-pinned 10.33.4; reused local dependency tree through an ignored node_modules symlink.
+- 125 related unit tests passed across work presence/preview, browser routes/panel, hook, coding chat and conversation timeline. Independent review found the empty-to-host-show edge case; added a failing regression, fixed it, and reran all 26 panel/hook tests successfully (one additional unique regression).
+- 10 isolated headless Chrome layout/E2E cases passed, including exact empty copy, no failure/retry UI, no teacher auto-open, and no checks over 60 seconds. Inspected the generated empty-state screenshot. No real Electron focus change or paid model requests.
+- Final standard `pnpm run typecheck`, scoped ESLint, `pnpm run build:vite` and `git diff --check` passed. Extended Main `tsc --project tsconfig.node.json --composite false --incremental false --noEmit` reports the same 66 error signatures as clean main at 077184a; no added diagnostics.
+- Independent review of scanner boundaries and complete change passed after fixing and verifying the host-show regression. Task documentation drift check passed.
+
+## Follow-ups
+
+- Source is ready for integration; running/installed client has not been updated. Integration, packaging and deployment were not requested.
+
+## Promotion Candidates
+
+- Target: canonical Code preview behavior/architecture during later serialized integration. Record that confirmed empty/material-only projects render a local empty state before creating a conversation or dispatching OPEN_WORK_PROMPT, while existing/uncertain work retains startup and healthy-address recovery. Evidence: user approval, Main side-effect assertions and UI regressions. Future impact: prevents browsing empty projects from adding operation-chat context or consuming model calls. This narrows the older always-start-on-missing-URL behavior; user approval is already supplied. No canonical documents changed in this feature task.