feat(web): complete portable Blender feature gaps

docs/tasks/WBV2-P1422-000.md

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+# WBV2-P1422-000: authorize full Web feature gap implementation
+
+- task: WBV2-P1422-000
+- parent: WBV2-P1421-001
+- status: done
+- nextTask: WBV2-P1422-001
+- gap inventory: `docs/WEB_FULL_FEATURE_GAP_INVENTORY.md`

docs/tasks/WBV2-P1422-001.md

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+# WBV2-P1422-001: complete full Web feature gap implementation
+
+- task: WBV2-P1422-001
+- parent: WBV2-P1422-000
+- status: in_progress
+- targetImplementationClass: PRODUCT_WORKFLOW
+- implementation entrypoint: `python3 my-tools/run_web_product_migration.py`
+- node tools/web/print-task-context.mjs
+- scope: `docs/WEB_FULL_FEATURE_GAP_INVENTORY.md` and pending tasks in `tests/golden/WBV2/web-product-backlog.json`
+- verification: deferred to user operation; do not run full validators in implementation turns
+
+## 目标
+
+Implement every pending user-reachable Web feature gap in the backlog through Blender Main/WASM routes, preserving browser-native equivalents for desktop-only UI.
+
+## 输入与范围
+
+- `docs/WEB_FULL_FEATURE_GAP_INVENTORY.md`
+- `tests/golden/WBV2/web-product-backlog.json`
+- owned source/protocol/Worker/UI paths listed by each pending task
+
+## 验收
+
+- one bounded implementation task per Codex turn
+- existing dirty changes are preserved
+- no JavaScript simulation replaces Blender Main behavior
+- verification remains deferred until user operation
+
+## 失败边界
+
+- failed turns remain pending and are retried
+- unsupported desktop-only or unavailable-resource paths fail closed
+- no task advances from a missing result artifact or unrelated file change
+
+## 交付与回滚
+
+- result artifacts: `tests/golden/WBV2/product-migration/*-result.json`
+- aggregate report: `tests/golden/WBV2-P1422-001/product-implementation-report.json`
+- rollback: stop the product runner and retain the last completed bounded task