Session titles: strip a leading machine-name prefix

- remote_task strips the device name from the title it creates, and tells the model not to include it
- session lists (Devices tab, sidebar, remote_devices) strip it from existing titles
- tests for stripDevicePrefix

test/title.test.mjs

@@ -0,0 +1,34 @@
+// Session titles must not start with the machine name. stripDevicePrefix is private to
+// index.js, so the test extracts its source and evaluates it.
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import fs from 'node:fs'
+
+const src = fs.readFileSync(new URL('../index.js', import.meta.url), 'utf8')
+const m = src.match(/const stripDevicePrefix = [\s\S]*?\n}\n/)
+assert.ok(m, 'stripDevicePrefix not found in index.js')
+const stripDevicePrefix = new Function(`${m[0]}; return stripDevicePrefix`)()
+
+test('removes a leading machine name with common separators', () => {
+  const names = ['ai-pc', 'AI PC']
+  assert.equal(stripDevicePrefix('ai-pc: git pull + unit tests', names), 'git pull + unit tests')
+  assert.equal(stripDevicePrefix('AI-PC - run tests', names), 'run tests')
+  assert.equal(stripDevicePrefix('[ai-pc] run tests', names), 'run tests')
+  assert.equal(stripDevicePrefix('(ai-pc) · run tests', names), 'run tests')
+  assert.equal(stripDevicePrefix('ai-pc | run tests', names), 'run tests')
+  assert.equal(stripDevicePrefix('ai-pc> run tests', names), 'run tests')
+})
+
+test('keeps titles that merely mention the machine, and empty titles', () => {
+  const names = ['ai-pc']
+  assert.equal(stripDevicePrefix('Test and fix ai-pc deployment', names), 'Test and fix ai-pc deployment')
+  assert.equal(stripDevicePrefix('ai-pc deployment notes', names), 'ai-pc deployment notes')
+  assert.equal(stripDevicePrefix('Clone and test ai-pc repository remotely', names), 'Clone and test ai-pc repository remotely')
+  assert.equal(stripDevicePrefix('', names), '')
+  assert.equal(stripDevicePrefix(null, names), '')
+})
+
+test('strips every known name, not only the first', () => {
+  assert.equal(stripDevicePrefix('Pelican-Node: backup', ['pelican-node', 'Pelican-Node']), 'backup')
+  assert.equal(stripDevicePrefix('mac: backup', ['mac', 'my-mac']), 'backup')
+})