Complete M16 driver button add parity

docs/EXECUTION_QUEUE.md

@@ -9,10 +9,10 @@
 | 字段 | 值 |
 | --- | --- |
 | 里程碑 | M16 Main、Mesh、Modifier、Sculpt |
-| 当前任务 | `M16-GAP-00174` |
-| parent manifest | `tests/golden/M16-GAP-00173/manifest.json` |
-| 任务卡 | [`tasks/M16-GAP-00174.md`](tasks/M16-GAP-00174.md) |
-| 专项验收 | `npm --prefix web run test:generated-gap -- --task M16-GAP-00174` |
+| 当前任务 | `M16-GAP-00175` |
+| parent manifest | `tests/golden/M16-GAP-00174/manifest.json` |
+| 任务卡 | [`tasks/M16-GAP-00175.md`](tasks/M16-GAP-00175.md) |
+| 专项验收 | `npm --prefix web run test:generated-gap -- --task M16-GAP-00175` |
 
 领取前执行：
 

docs/status/M16-GAP-00174.md

@@ -1,18 +1,17 @@
 # M16-GAP-00174 Status
 
-status: in_progress
+status: done
 task: anim.driver_button_add operator LOCAL_EXACT slice
 updated: 2026-08-21 America/New_York
 
 scope:
 
-- The minimal fixture contains an un-driven `drive_target` property; the reader preserves the object and the absence of drivers for WASM/Main.
+- The minimal fixture contains an un-driven `drive_target` property; foreground Chromium-compatible Blender UI automation invokes `ANIM_OT_driver_button_add` on that exact RNA button and the reader preserves the resulting driver for WASM/Main.
 
 evidence:
 
-- Blender desktop reaches the mandated Properties context, where `ANIM_OT_driver_button_add` reports `poll=false` because no active RNA button exists in `-b`; no operator mutation occurs.
-- Desktop and WASM/Main preserve the same un-driven object; save/reopen is exact and malformed Blend input is rejected without Main mutation.
-- Fixture generation, desktop checker, npm comparator, direct comparator, and artifact hashing passed.
-- Cancellation is an explicit task boundary, so this task remains `in_progress` and does not advance `nextTask`.
+- Blender desktop registers a focused Properties panel, activates the real RNA button, and invokes `ANIM_OT_driver_button_add` through the UI context (`poll=true`, `FINISHED`, `DRIVER_ADDED`).
+- Desktop and WASM/Main expose the same scripted driver on `["drive_target"]` (`var + 4.5`, one default transform variable); save/reopen is exact and malformed Blend input is rejected without Main mutation.
+- Fixture generation, foreground desktop checker, npm comparator, direct comparator, governance, and artifact hashing passed. The checker is idempotent for the already-mutated exact fixture.
 
-nextTask: `M16-GAP-00174`
+nextTask: `M16-GAP-00175`

docs/tasks/M16-GAP-00175.md

@@ -0,0 +1,37 @@
+# M16-GAP-00175: operator:anim.driver_button_edit LOCAL_EXACT slice
+
+- task: M16-GAP-00175
+- parent: M16-GAP-00174
+- status: in_progress
+- gap: operator:anim.driver_button_edit
+- ownerFamily: OPERATOR
+- targetImplementationClass: LOCAL_EXACT
+
+## 目标
+
+Make the same minimal fixture produce observable operator:anim.driver_button_edit data in Blender desktop and WASM/Main, with save/reopen stability. Change only this gap; do not expand to other data-blocks, editors, or browsers.
+
+## 输入与范围
+
+- Fixture: `tests/files/web/generated/M16-GAP-00175-operator-anim.driver_button_edit.blend`
+- Generator: `tools/web/generated/M16-GAP-00175.py`
+- Production: `blender-5.2.0/source/blender/web_engine/web_engine_blend_reader.cpp`
+- Checker: `tools/web/check-generated-gap.mjs`
+- Do: field read, desktop/WASM comparison, save/reopen, structured report.
+- Do not: other gaps, Firefox/WebKit, or full editor behavior.
+
+## 验收
+
+build_blender_5.2.0/bin/blender -b --factory-startup --python tools/web/generated/M16-GAP-00175.py -- tests/files/web/generated/M16-GAP-00175-operator-anim.driver_button_edit.blend
+npm --prefix web run test:generated-gap -- --task M16-GAP-00175
+node tools/web/check-generated-gap.mjs --task M16-GAP-00175
+
+Malformed/unsupported, cancellation, duplicate, over-budget, or hash-drift cases must keep in_progress; they must not change Main revision or advance nextTask.
+
+## 交付与回滚
+
+- Reports: `tests/golden/M16-GAP-00175/`
+- Status: `docs/status/M16-GAP-00175.md`
+- Manifest: `tests/golden/M16-GAP-00175/manifest.json`
+- Handoff: `node tools/web/check-task-context.mjs --task M16-GAP-00175 --write`
+- Rollback: remove this task production entry, fixture, tests, reports, manifest, status, and context; restore the parent as queue tail without rewriting parent evidence.