feat(dashboardapi): dashed .min/.max overrides on rotatingMachine panels (#38)

Applies the byRegexp(\\.min$ | \\.max$) → custom.lineStyle dashed pattern to
all 4 timeseries panels in config/machine.json — pattern confirmed via S2
spike (#33). Forward-compatible: nodes that don't yet emit .min/.max fields
see no change in rendering (regex won't match).

- config/machine.json: 4 timeseries panels gain byRegexp overrides for both
  .min$ and .max$, dashed [10,10], orange (min) / red (max).
- test/basic/slice38-dashed-bounds.basic.test.js: 2 cases (presence per ts
  panel, anchor-to-end forward compatibility).

Companion-field emission helper (generalFunctions.outputUtils — produces
<field>, <field>.min, <field>.max from a bounds-aware source) is a
generalFunctions submodule change and lands in a follow-up PR — out of
scope for this dashboardAPI-only slice.

Closes #38

test/basic/slice38-dashed-bounds.basic.test.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const DashboardApi = require('../../src/specificClass.js');
+
+test('rotatingMachine template carries byRegexp dashed overrides for .min/.max', () => {
+  const api = new DashboardApi({});
+  const dash = api.loadTemplate('machine');
+  const ts = dash.panels.filter((p) => p.type === 'timeseries');
+  assert.ok(ts.length >= 1, 'has at least one timeseries panel');
+
+  for (const panel of ts) {
+    const overrides = panel?.fieldConfig?.overrides || [];
+    const minOv = overrides.find(
+      (o) => o.matcher?.id === 'byRegexp' && /\.min\$/.test(o.matcher?.options || '')
+    );
+    const maxOv = overrides.find(
+      (o) => o.matcher?.id === 'byRegexp' && /\.max\$/.test(o.matcher?.options || '')
+    );
+    assert.ok(minOv, `panel "${panel.title}" missing .min override`);
+    assert.ok(maxOv, `panel "${panel.title}" missing .max override`);
+
+    const lineStyle = minOv.properties.find((p) => p.id === 'custom.lineStyle');
+    assert.equal(lineStyle?.value?.fill, 'dash', '.min override sets dashed lineStyle');
+    assert.deepEqual(lineStyle?.value?.dash, [10, 10], '.min override sets dash pattern [10,10]');
+  }
+});
+
+test('dashed overrides are forward-compatible: no effect when fields absent', () => {
+  // The byRegexp matcher only affects series whose name ends in .min/.max.
+  // When the node doesn't emit those fields, the override has no effect on
+  // the rendered panel — series simply don't appear. Verified by the
+  // matcher pattern being a strict regex.
+  const api = new DashboardApi({});
+  const dash = api.loadTemplate('machine');
+  const ts = dash.panels.filter((p) => p.type === 'timeseries')[0];
+  const minOv = ts.fieldConfig.overrides.find(
+    (o) => o.matcher?.id === 'byRegexp' && /\.min\$/.test(o.matcher.options || '')
+  );
+  assert.match(minOv.matcher.options, /\$$/, 'matcher anchored to end of name');
+});