feat(agent): unify send(target × wakeup), coalesce context/message into user/message

Replace send/steer/inject with one Agent.send primitive over the
(target × wakeup) matrix; followup/steer/inject become fixed-preset
alias methods on the now-abstract Agent class. Coalesce context/message
into user/message (injected context is a non-user source). Replace
agent/queued with agent/inbox/enqueue/dequeue/discard, add cancel
keepInbox, and add a FIFO-conservation invariant.

packages/ui/acp/tests/bridge.spec.ts

@@ -383,7 +383,7 @@ describe('acp bridge', () => {
         },
       }],
     })
-    expect(target.events.some(event => event.type === 'context/message')).toBe(false)
+    expect(target.events.some(event => event.type === 'user/message' && event.data.source.kind !== 'user')).toBe(false)
     const request = JSON.stringify(harness.adapter.requests[0]?.messages)
     expect(request).toContain('untrusted, read-only snapshot')
     expect(request).toContain('source background')

packages/ui/acp/tests/turns.spec.ts

@@ -285,10 +285,10 @@ describe('acp bridge — turn outcomes', () => {
     const sessionId = await newSession(harness)
     const agent = harness.ctx.agents.get(SessionId(sessionId))!
     // On the queued prompt, synchronously inject a one-shot context turn (idle
-    // inject writes turn/start{injection} → context/message → turn/end). Fire
+    // inject writes turn/start{injection} → user/message → turn/end). Fire
     // once so it lands between install and the prompt turn.
     let injected = false
-    harness.ctx.on('agent/queued', (subject) => {
+    harness.ctx.on('agent/inbox/enqueue', (subject) => {
       if (subject === agent && !injected) {
         injected = true
         agent.inject([{ type: 'text', text: 'ctx note' }], { source: { kind: 'plugin', plugin: 'test' } })