Complete Grease Pencil vertex proximity gap

docs/tasks/M16-GAP-00072.md

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+# M16-GAP-00072: modifier:HOOK LOCAL_EXACT slice
+
+- task: M16-GAP-00072
+- parent: M16-GAP-00071
+- status: in_progress
+- gap: modifier:HOOK
+- ownerFamily: MODIFIER
+- targetImplementationClass: LOCAL_EXACT
+
+## 目标
+
+Make the same minimal fixture produce observable modifier:HOOK 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-00072-modifier-HOOK.blend`
+- Generator: `tools/web/generated/M16-GAP-00072.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-00072.py -- tests/files/web/generated/M16-GAP-00072-modifier-HOOK.blend
+npm --prefix web run test:generated-gap -- --task M16-GAP-00072
+node tools/web/check-generated-gap.mjs --task M16-GAP-00072
+
+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-00072/`
+- Status: `docs/status/M16-GAP-00072.md`
+- Manifest: `tests/golden/M16-GAP-00072/manifest.json`
+- Handoff: `node tools/web/check-task-context.mjs --task M16-GAP-00072 --write`
+- Rollback: remove this task production entry, fixture, tests, reports, manifest, status, and context; restore the parent as queue tail without rewriting parent evidence.