Phase 1 & 2: Baseline experiments + AGoT implementation + reasoning graph analysis

## Added

### Core framework
- src/llm_client.py — Ollama API wrapper for local Docker inference
- src/samples.py — Embedded benchmark datasets (GSM8K/MATH/AIME + Chinese)
- src/run_all.py — Unified experiment runner

### Phase 1: Baselines
- src/baseline/benchmark.py — IO, CoT, CoT-SC, ToT evaluation with Chinese support

### Phase 2: AGoT
- src/agot/agot.py — AGoT core algorithm (6 agent types, recursive decomposition)
- src/agot/graph_utils.py — DAG graph data structure with cycle detection
- src/agot/prompts.py — 6 agent prompt templates (EN + ZH)
- src/agot/run.py — AGoT experiment runner

### Graph Analysis
- src/graph_analysis/reasoning_graph.py — Graph property computation (cyclicity, diameter, small-world)
- src/graph_analysis/visualize.py — Visualization charts

### Documentation
- docs/graph_reasoning_principles.md — Comprehensive principles document
- docs/next_steps.md — Roadmap for reliable reasoning tool

### Experiment Results
- GSM8K/MATH baselines on qwen2.5:32b and qwq:latest
- AGoT validation (100% on small sample)
- Chinese dataset benchmarks (C-GSM8K, CMATH)
- Graph property analysis confirming Topology of Reasoning findings

data/results/cmath_IO_qwen2.5_32b_20260703_183157.json

@@ -0,0 +1,40 @@
+{
+  "summary": {
+    "method": "IO",
+    "model": "qwen2.5:32b",
+    "task": "cmath",
+    "samples": 3,
+    "correct": 1,
+    "accuracy": 0.3333,
+    "avg_time_s": 0.51
+  },
+  "details": [
+    {
+      "question": "已知函数 $f(x) = 2x^2 - 4x + 1$，求 $f(x)$ 的最小值。",
+      "expected": "-1",
+      "predicted": "-1",
+      "full_response": "-1",
+      "correct": true,
+      "time_s": 0.5,
+      "tokens": 1
+    },
+    {
+      "question": "在等差数列 $\\{a_n\\}$ 中，$a_1 = 3$，$a_3 + a_5 = 22$，求 $a_7$ 的值。",
+      "expected": "25",
+      "predicted": "15",
+      "full_response": "15",
+      "correct": false,
+      "time_s": 0.47,
+      "tokens": 1
+    },
+    {
+      "question": "从 3 名男生和 2 名女生中选出 2 人参加志愿者活动，求选出的两人恰好是一男一女的概率。",
+      "expected": "3/5",
+      "predicted": "0.6",
+      "full_response": "0.6",
+      "correct": false,
+      "time_s": 0.56,
+      "tokens": 2
+    }
+  ]
+}