[Qiyuanqiii]

Summary

• make Thread the stable task/history term across primary navigation, empty states, composers, lifecycle copy, and errors
• present Run as one execution attempt, move Session into an explicitly explained advanced diagnostics view, and qualify retained child/batch task meanings
• present WorkItem as Plan item while keeping API, Go, event, and SQLite identities intact
• add bilingual CLI help and synchronized Chinese/English user documentation for the canonical vocabulary and compatibility identifiers
• add unit, inline snapshot, accessibility, OpenAPI/event, and SQLite identity guards

Compatibility

This is a presentation-only migration. It does not rename /api/v1/runs, /api/v1/sessions, OpenAPI schemas, event types, SQLite tables or columns, the cyberagent binary, CYBERAGENT_*, or .prayu/....

Verification

• go test -timeout 60m -count=1 ./...
• go vet ./...
• go mod verify
• go mod tidy -diff
• go run ./cmd/protocolregistry -check -baseline <origin/main sha>
• go run ./cmd/surfacecheck
• npm test (71 files, 338 tests)
• npm run typecheck
• npm run build
• npm run check:api

Closes #166