Turn Instruction into a chat with an agent that asks

The Instruction page is now a conversation with the Express Agent. Each
message updates the draft plan, and when something is unclear (a part it
did not understand, a video count with no cadence, a schedule over 50 per
week, weekly research with no day, a missing topic) the agent asks right
in the chat, one question at a time, with replies to pick or type. Once
the plan is clear it offers to start the schedules and reports the result
in the chat. The plan stays editable beside the chat.

The chat text is also larger and darker than the mockup's 9-11px grey.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/express/agent.test.ts

@@ -0,0 +1,55 @@
+import { describe, expect, it } from 'vitest'
+import { EMPTY, nextQuestion, respond, type AgentState } from './agent'
+import { t } from '../i18n'
+
+const say = (...inputs: string[]) => inputs.reduce<AgentState>((s, input) => respond(s, input).state, EMPTY)
+const rules = (s: AgentState) => s.items.map(i => i.rule)
+
+describe('instruction agent', () => {
+  it('needs no question when the instruction is complete', () => {
+    const s = say('make 2 summaries per day about leadership')
+    expect(nextQuestion(s)).toBeNull()
+    expect(respond(s, 'yes').approve).toBe(true)
+  })
+
+  it('asks for a topic, and takes the reply as the topic', () => {
+    const s = say('make 3 quizzes per week')
+    expect(nextQuestion(s)?.type).toBe('topic')
+    expect(rules(say('make 3 quizzes per week', 'negotiation'))[0]).toMatchObject({ topic: 'negotiation' })
+  })
+
+  it('stops asking for a topic once the whole Brain is chosen', () => {
+    expect(nextQuestion(say('make 3 quizzes per week', t('agent.optWholeBrain')))).toBeNull()
+  })
+
+  it('asks about a video count that has no cadence', () => {
+    const s = say('3 videos per week about onboarding')
+    expect(nextQuestion(s)?.type).toBe('video')
+    expect(rules(say('3 videos per week about onboarding', t('agent.optPerDay')))[0]).toMatchObject({ count: 1, per: 'day' })
+  })
+
+  it('asks which day weekly research runs when none was named', () => {
+    const s = say('research every week about sales')
+    expect(nextQuestion(s)?.type).toBe('weekday')
+    const answered = say('research every week about sales', 'thursday')
+    expect(rules(answered)[0]).toMatchObject({ weekday: 3, weekdayGuessed: undefined })
+    expect(nextQuestion(answered)).toBeNull()
+  })
+
+  it('asks about parts it did not understand, and can skip them', () => {
+    const s = say('2 summaries per day about sales. hello there')
+    expect(nextQuestion(s)).toMatchObject({ type: 'unknown', text: 'hello there' })
+    expect(nextQuestion(say('2 summaries per day about sales. hello there', 'skip'))).toBeNull()
+  })
+
+  it('treats a reply with a frequency as a new request', () => {
+    const s = say('make 3 quizzes per week', '1 video per week about onboarding')
+    expect(rules(s).map(r => r.type === 'content' && r.kind)).toEqual(['quiz', 'video'])
+  })
+
+  it('caps a schedule that is over the weekly limit', () => {
+    const s = say('10 summaries per day about sales')
+    expect(nextQuestion(s)?.type).toBe('tooMany')
+    expect(rules(say('10 summaries per day about sales', '30 per week'))[0]).toMatchObject({ count: 30, per: 'week' })
+  })
+})