feat: parameterize complex junction geometry with Gaode reference

- 高德 GeoJSON 参考流程: `scripts/lib/gaode-junction-reference.js`
  与 `scripts/inspect-junction-reference.js` 将 GCJ-02 参考转换为 WGS84,
  按 node id/最近距离关联 OSM, 支持普通路口面和 `complex-cluster` 两种匹配。
- 复合路口模板 `complex-junction-v1`: `scripts/lib/complex-junction.js` 用参考
  几何校准 core 半径, 生成路口面、进口路面、斑马线、停止线、角部圆角与安全岛;
  拓扑/信号/连接全部沿用 OSM/native。
- 车道中心线控制要素避让: `compileLaneCenterlines` 现接收模板已产出的斑马线/停止线,
  新增 `trimLaneOutsideControls` 按到路口中心的半径定向裁剪; 标线源几何同步裁剪, 不再
  越过斑马线继续画到核心区。拓扑几何不变, connector 集合前后一致。
- 复合路口人行道转角: `buildComplexJunctionGeometry` 沿已定义的路缘生成 2m 宽转角带,
  复用圆角曲线, 通过 `islands` 通道并入 `sidewalk_surface`; 自交或坐标非有限时报
  `complex-junction-sidewalk-corner-fallback` 并跳过。
- 新增诊断: `complex-junction-configured-radius-ignored`、
  `lane-centerline-fully-inside-control`、`complex-junction-sidewalk-corner-fallback`。
- 死码清理: 移除未被调用的 `clusterApproachRing`。
- spec 更新: `.trellis/spec/pipeline/cli-and-stages.md` 复合路口小节补充控制要素
  避让顺序、人行道转角契约、Validation 矩阵三行; 索引新增导航。
- 任务产物 `08-19-gaode-junction-reference`: 8 条验收标准全部实测记录,
  Scope Drift / Verification Log / Known Gaps 三节沉淀本次工作。

Regression: test:native-road / test:road-workbench / test:preflight /
test:native-preview-traffic / test:package-contract / test:traffic-signals /
test:gaode-junction-reference 全绿; road:check ok=true, errors=[]。

.trellis/tasks/08-19-gaode-junction-reference/design.md

@@ -0,0 +1,57 @@
+# Technical Design
+
+## Boundary
+
+The native compiler remains authoritative for OSM road identity, directed lanes,
+connections, traffic signals, stop lines, and preview routes. A reference layer is
+an optional geometry-calibration input consumed before junction surface publication.
+
+## Proposed Flow
+
+```text
+optional reference GeoJSON (GCJ-02)
+  -> validate schema and coordinate bounds
+  -> GCJ-02 to WGS84 conversion
+  -> associate reference footprint with an OSM junction node
+  -> classify geometry by observable shape, not opaque vendor type alone
+  -> derive bounded junction-shape parameters
+  -> native compiler creates surface/connectors as usual
+  -> diagnostics compare generated geometry with reference
+```
+
+The first production validation keeps the reference overlay/diagnostic, then enables a
+bounded `cross` junction template for explicitly configured references. Connector
+endpoints and movement enumeration still come from the native model. T and complex
+junctions remain on the existing algorithm until their templates are separately validated.
+
+## Input Contract
+
+Use an optional area-level reference configuration rather than a hard-coded filename.
+The sample points to `inputs/osm/珠山湖大道（枫树二路）口.geojson`, declares `GCJ-02`,
+and identifies the target through OSM node `8005332807` or a stable spatial/name match.
+The file is not assumed to contain a CRS member; the configured source CRS is required.
+
+## Geometry Safety
+
+- Convert all reference coordinates to WGS84 before distance/overlap tests.
+- Reject malformed or non-finite coordinates and references outside the OSM bounds plus a
+  bounded tolerance.
+- Never let a reference polygon create a movement, lane, signal, or stop-line record.
+- Keep a fallback path to the current `compileGeometry()` junction algorithm.
+
+## Compatibility And Rollback
+
+No-reference configs and existing output schemas remain unchanged. The experiment can be
+disabled by omitting the reference section or setting it disabled. Generated diagnostics
+must record source file hash, conversion mode, matched OSM node, and whether fallback was used.
+No source reference file is rewritten.
+
+## Open Technical Work
+
+1. Select the smallest reusable geometry parameter set from the sample (approach cutback,
+   corner radius/rounding, island/marking envelopes, and tolerances).
+2. Implement and test GCJ-02 conversion independently from compiler logic.
+3. Compare the sample against all native junctions near the converted footprint before any
+   production surface override is enabled.
+4. Add topology classification and template dispatch; only cross is enabled in this validation.
+5. Preserve native connectors and controls while replacing only the bounded junction surface geometry.