Advance deduplicated object deletion coverage

docs/tasks/WBV2-P22-002.md

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+# WBV2-P22-002: object delete engine receipt
+
+- task: WBV2-P22-002
+- parent: WBV2-P22-001
+- status: in_progress
+- gap: capability:OBJECT_OPERATIONS.DELETE
+- ownerFamily: OBJECT
+- targetImplementationClass: LOCAL_EXACT
+
+## 目标
+
+Bind deleteObject, undo/redo, malformed rejection, and exact save/reopen to compiled WASM Main in Chromium.
+
+## 输入与范围
+
+- Focused source: `tests/golden/WBV2-P22-001/object-delete-selection-report.json`
+- Production test: `web/tests/e2e/wbv2-object-delete-production.spec.ts`
+- Production entrypoint: `npm --prefix web run test:e2e -- --workers=1 tests/e2e/wbv2-object-delete-production.spec.ts`
+
+## 验收
+
+- object deletion changes Main
+- undo/redo revisions are sequential
+- malformed delete fails closed without Main mutation
+- save/reopen is exact and deterministic
+- Chromium is the only browser
+- `node tools/web/check-task-context.mjs --task WBV2-P22-002 --write`
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P22-002/`
+- Status: `docs/status/WBV2-P22-002.md`
+- Manifest: `tests/golden/WBV2-P22-002/manifest.json`
+- Rollback: restore P22-001 as queue parent.