refactor(agent): unify sourced message delivery

packages/context/time-context/README.md

@@ -18,7 +18,7 @@ When `timeZone` is omitted, the plugin resolves the Node process's system zone o
 
 ## Timing semantics
 
-The plugin prepends an `agent/pre-step` listener. When an injection is due, it appends one injected `user/message` through `agent.inject()` before `step/start` and ordinary automatic compaction, with source `{ kind: 'plugin', plugin: 'time-context' }`. A suppressed attempt appends nothing.
+The plugin prepends an `agent/step` listener. When an injection is due, it appends one injected `user/message` through `agent.inject()` before `step/start` and ordinary automatic compaction, with source `{ kind: 'plugin', plugin: 'time-context' }`. A suppressed attempt appends nothing.
 
 Positive-interval scheduling scans the raw durable session events for the latest `user/message` with that source, including a reading shadowed by compaction. The schedule therefore applies across turns and resumed processes without process-local cache state. It reduces append frequency and history growth but never removes an existing reading, and sessions schedule independently.
 

packages/context/time-context/src/index.ts

@@ -173,9 +173,6 @@ export function apply(ctx: Context, config: Config): void {
     const previous = step === 1
       ? precedingMessageTime(agent)
       : precedingStepContextTime(agent, turn)
-    agent.inject(
-      [{ type: 'text', text: renderText(now, turn, step, previous, formatter, resolvedTimeZone) }],
-      { source: { kind: 'plugin', plugin: name } },
-    )
+    agent.inject({ content: [{ type: 'text', text: renderText(now, turn, step, previous, formatter, resolvedTimeZone) }], source: { kind: 'plugin', plugin: name } })
   }, { prepend: true })
 }

packages/context/time-context/tests/time-context.spec.ts

@@ -44,11 +44,8 @@ function sessionAgent(session: Session, id = 'agent'): Agent {
     ctx: new Context(),
     followup: () => AgentMessageId('stub'),
     steer: () => AgentMessageId('stub'),
-    inject(content, options) {
-      session.append('user/message', {
-        content,
-        source: options?.source ?? { kind: 'user' },
-      }, { surfaceOp: 'append' })
+    inject(input) {
+      session.append('user/message', input, { surfaceOp: 'append' })
       return AgentMessageId('stub')
     },
     send: () => AgentMessageId('stub'),
@@ -374,7 +371,7 @@ describe('real agent-loop request history', () => {
     })
     const agent = ctx.agentLoop.create(SessionId(`late-${mode}`), { provider: 'mock', model: 'mock' })
 
-    agent.followup([{ type: 'text', text: 'start' }])
+    agent.followup({ content: [{ type: 'text', text: 'start' }], source: { kind: 'user' } })
     await agent.whenIdle()
 
     expect(laterSawReading).toBe(false)
@@ -400,7 +397,7 @@ describe('real agent-loop request history', () => {
     }))
     const agent = ctx.agentLoop.create(SessionId('loop'), { provider: 'mock', model: 'mock' })
 
-    agent.followup([{ type: 'text', text: 'start' }])
+    agent.followup({ content: [{ type: 'text', text: 'start' }], source: { kind: 'user' } })
     await agent.whenIdle()
 
     expect(adapter.requests).toHaveLength(2)