feat(hermes): add session runtime config form

tests/hermes-session-runtime-config.test.js

@@ -0,0 +1,79 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+
+import {
+  buildHermesSessionRuntimeConfigValues,
+  mergeHermesSessionRuntimeConfig,
+} from '../scripts/dev-api.js'
+
+test('Hermes 会话运行时配置读取会提供稳定表单默认值', () => {
+  const values = buildHermesSessionRuntimeConfigValues({})
+
+  assert.deepEqual(values, {
+    sessionResetMode: 'both',
+    idleMinutes: 1440,
+    atHour: 4,
+    groupSessionsPerUser: true,
+    threadSessionsPerUser: false,
+  })
+})
+
+test('Hermes 会话运行时配置读取会回显 session_reset 与隔离开关', () => {
+  const values = buildHermesSessionRuntimeConfigValues({
+    session_reset: {
+      mode: 'daily',
+      idle_minutes: 720,
+      at_hour: 3,
+    },
+    group_sessions_per_user: false,
+    thread_sessions_per_user: true,
+  })
+
+  assert.equal(values.sessionResetMode, 'daily')
+  assert.equal(values.idleMinutes, 720)
+  assert.equal(values.atHour, 3)
+  assert.equal(values.groupSessionsPerUser, false)
+  assert.equal(values.threadSessionsPerUser, true)
+})
+
+test('Hermes 会话运行时配置保存会保留无关 YAML 并写入 snake_case 字段', () => {
+  const next = mergeHermesSessionRuntimeConfig({
+    model: { provider: 'anthropic', default: 'claude-sonnet-4-6' },
+    session_reset: {
+      mode: 'idle',
+      idle_minutes: 60,
+      custom_flag: 'keep-me',
+    },
+    streaming: { enabled: true },
+  }, {
+    sessionResetMode: 'both',
+    idleMinutes: '90',
+    atHour: '6',
+    groupSessionsPerUser: false,
+    threadSessionsPerUser: true,
+  })
+
+  assert.deepEqual(next.model, { provider: 'anthropic', default: 'claude-sonnet-4-6' })
+  assert.deepEqual(next.streaming, { enabled: true })
+  assert.equal(next.session_reset.mode, 'both')
+  assert.equal(next.session_reset.idle_minutes, 90)
+  assert.equal(next.session_reset.at_hour, 6)
+  assert.equal(next.session_reset.custom_flag, 'keep-me')
+  assert.equal(next.group_sessions_per_user, false)
+  assert.equal(next.thread_sessions_per_user, true)
+})
+
+test('Hermes 会话运行时配置保存会拒绝非法模式和范围', () => {
+  assert.throws(
+    () => mergeHermesSessionRuntimeConfig({}, { sessionResetMode: 'weekly' }),
+    /session_reset\.mode/,
+  )
+  assert.throws(
+    () => mergeHermesSessionRuntimeConfig({}, { idleMinutes: '0' }),
+    /idle_minutes/,
+  )
+  assert.throws(
+    () => mergeHermesSessionRuntimeConfig({}, { atHour: '24' }),
+    /at_hour/,
+  )
+})