feat(web): drive 6900 work by capability families

nextTask.md

@@ -16,6 +16,15 @@ external documentation are supplemental references for toolchain/browser
 constraints only; they cannot override or replace behavior present in the
 Blender source.
 
+Implementation iron rule: advance the 6900-entry inventory through capability
+families and unique behavior batches at maximum practical throughput. Do not
+run Chromium, E2E receipts, parity verification, save/reopen verification,
+determinism checks, or completion overlays in this implementation lane. The
+only allowed checks are source compilation, TypeScript/type safety, lint,
+bounded build and queue/governance integrity needed to avoid committing broken
+functionality. Do not drift into repeated maintenance-only waves while an
+unimplemented Blender capability family remains available.
+
 ## Copyable Resume Prompt
 
 Use the following prompt when continuous execution is needed. It is the
@@ -42,6 +51,7 @@ and (when authorized) repository push:
 11. 每轮结束报告实现切片、当前任务、`nextTask`、最小检查退出码、原始 inventory、effective inventory 是否保持不变、提交/推送状态和剩余真实阻塞。
 12. CONTINUOUS_LOOP_REQUIRED：成功交接后立即开始下一轮；不得在成功提交、推送或生成新 manifest 后等待用户确认、只写计划或只汇报状态。每轮必须重新运行 `print-task-context` 和 `check-task-context`，使用新 parent manifest 的 `nextTask`，不沿用上一轮上下文。
 13. 可使用仓库内 unattended runner 保持进程级连续执行：`node tools/web/run-wbv2-continuous.mjs --max-iterations 0`。它只执行任务卡声明的入口；`0` 表示不限轮数，`--max-iterations N` 用于受控运行，`--commit --push` 才允许自动提交/推送。任何入口失败、退出 0 但队列未前进、治理失败或 push 失败都立即停止并保留 `tests/golden/<task>/continuous-runner.log`，不得重试未知结果。
+14. 6900_IMPLEMENTATION_IRON_RULE：只按 capability family 和唯一行为批次实现全部 Blender 功能；不启动 Chromium/E2E/receipt/parity/save-reopen/determinism 验证，不写 completion overlay，不把维护 smoke 当作能力完成。若任务卡与本铁律冲突，以源码实现和本铁律为准，并将验证留到后续独立验证波次。
 ```
 
 ## Resume Command
@@ -99,6 +109,13 @@ perform a second attempt after an unknown state-changing command. A root task
 is itself an executable enabling task: run its declared root generator, then
 continue from the generated child task in the same continuous run.
 
+Every implementation iteration must answer one question before editing: which
+capability family or unique behavior from the immutable 6900 inventory becomes
+more implemented by this change? If the answer is only "maintenance", skip it
+when a source-backed capability slice is available. Maintain the original
+inventory and provenance; implementation progress is recorded in task reports,
+not completion overlays.
+
 For process-level unattended execution, run:
 
 ```bash
@@ -249,12 +266,12 @@ Recorded: 2026-08-29 Asia/Shanghai
 
 | Field | Value |
 | --- | --- |
-| Current task when this file was written | `WBV2-P43-000` |
+| Current task when this file was written | `WBV2-P44-000` |
 | Current task state | `in_progress` |
-| Parent manifest | `tests/golden/WBV2-P42-003/manifest.json` |
-| Current task card | `docs/tasks/WBV2-P43-000.md` |
+| Parent manifest | `tests/golden/WBV2-P43-003/manifest.json` |
+| Current task card | `docs/tasks/WBV2-P44-000.md` |
 | Current task-context nextTask | `NONE` |
-| Focused command | `node tools/web/generate-wbv2-continuous-root.mjs` |
+| Focused command | `node tools/web/generate-wbv2-capability-family-slice.mjs --task WBV2-P44-000 --write` |
 
 The snapshot is informational and may become stale. On every resume, the queue,
 parent manifest, and fresh `print-task-context` output win. Never infer a task
@@ -264,6 +281,7 @@ number from this table or from historical status files.
 
 - Chromium is the only permitted browser runtime; never run Firefox or WebKit.
 - `blender-5.2.0` source and Blender Main are the behavior authority; web references are supplemental and must be recorded only when they affect build/runtime constraints.
+- The 6900 implementation lane is verification-free: no Chromium/E2E receipts, parity overlays, save/reopen or determinism runs until a separately authorized verification wave.
 - Do not read full historical plans, all status logs, or the full gap plan by
   default.
 - Keep unrelated user changes. Never use `git reset --hard` or `git checkout --`.