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feat(agent): add LangGraph scaffold for assignment 1

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- src/agent/state.py: minimal five-field AgentState
- src/agent/graph.py: START -> normalize_input -> reply -> END,
  compiled with InMemorySaver; reply emits <state>1002</state> prefix
- examples/langgraph_smoke.py: offline smoke, turns 1/2/1 verified
- test/agent/test_scaffold.py: turn accumulation, thread isolation,
  fixed-template assertions (3 passed)
- requirements.txt: pin langgraph==1.2.9

Known limit: InMemorySaver state disappears on process exit.
This commit is contained in:
Eric Wang
2026-10-19 13:32:43 +08:00
parent a9a1393f64
commit 5020903791
6 changed files with 211 additions and 0 deletions
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requirements.txt
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@@ -21,3 +21,4 @@ requests
sqlalchemy
pymysql
PyYAML>=6.0
langgraph==1.2.9