docs(milestone): complete v0.2-ai-tutor-architecture

---ci---
phase: 7
milestone: v0.2
status: complete
requirements:
  covered: [REQ-2-001, REQ-2-002, REQ-2-003, REQ-2-004, REQ-2-005, REQ-2-006, REQ-2-007, REQ-2-008, REQ-2-009, REQ-2-010, REQ-2-011, REQ-2-012]
  partial: []
---/ci---

Milestone v0.2 (ai-tutor-architecture) merged to main.

Escalation record (audit remediation, durable): P1 executor
delegation failed twice (empty subagent results, zero files
created); auto-resolved at full autonomy to inline execution with
identical plan fidelity (commit 3271373, reflog-only after phase
branch squash-delete).

apps/ai-service/ai_service/agents/lab.py

@@ -0,0 +1,37 @@
+"""LabAgent — in-flow feedback over simulated sandbox telemetry (REQ-2-007).
+
+Scenario-driven: consumes a LabTelemetryScenario from the corpus, renders
+the event timeline into the conversation, streams concrete feedback.
+No session chat — each request is one scenario read.
+"""
+
+from collections.abc import AsyncIterator
+
+from ..config import Settings
+from ..corpus.learner_context import LearnerContext, get_learner_context
+from ..corpus.telemetry import LabTelemetryScenario, summarize_scenario
+from ..llm.base import LLMProvider
+from ..prompts.lab import SYSTEM_PROMPT, render_context
+from .base import BaseAgent
+
+
+class LabAgent(BaseAgent):
+    name = "lab"
+
+    def __init__(self, provider: LLMProvider, settings: Settings) -> None:
+        super().__init__(provider, settings)
+
+    def system_prompt(self, learner_context: LearnerContext | None = None) -> str:
+        ctx = learner_context or get_learner_context()
+        return SYSTEM_PROMPT.format_map(render_context(ctx))
+
+    async def stream_feedback(
+        self,
+        scenario: LabTelemetryScenario,
+        learner_context: LearnerContext | None = None,
+    ) -> AsyncIterator[str]:
+        timeline = summarize_scenario(scenario)
+        async for token in self.stream_reply(
+            history=None, user_input=timeline, learner_context=learner_context
+        ):
+            yield token