feat(trajectory): D1 轨迹飞轮 — 汇聚标注 + SFT/DPO/GRPO 导出 (#50 #51)

[dahai80]

概述

实现 D1 轨迹飞轮, 把 fusion-code 会话产生的 session jsonl 清洗为 fusion-trainer 可消费的训练数据集。

Closes #50 (统一汇聚目录 + is_error 标注)
Closes #51 (三格式导出 CLI: SFT/DPO/GRPO)

数据流

~/.fusion-code/projects/**/*.jsonl  →  collect  →  ~/.fusion/trajectories/{manifest.json, raw/*.jsonl}
                                                              ↓  export --format
                                            ~/.fusion/trajectories/{sft,dpo,grpo}.jsonl

标注规则

• positive — 全程无 is_error=true → SFT
• self_correction — 至少一次 tool 失败后自纠正 → DPO (rejected/chosen) + GRPO (reward=0)

CLI

fusion-code trajectory collect [--source DIR] [--dest DIR] [--product NAME]
fusion-code trajectory export  --format sft|dpo|grpo [--dest DIR] [--session ID]
fusion-code trajectory manifest [--dest DIR]
fusion-code trajectory list     [--dest DIR]

模块

• src/services/trajectory/{types,collector,exporters,index}.ts
• src/cli/handlers/trajectory.ts (trajectoryMain)
• src/entrypoints/cli.tsx fast-path 注册
• src/__tests__/trajectory/trajectory.test.ts (11 pass)
• docs/trajectory-pipeline.md + README.md

验证

• tsc --noEmit: clean
• biome lint: 0 error (13 style infos)
• bun test: 11/11 pass
• bun run build: green
• 端到端冒烟: collect → manifest → export sft/dpo/grpo 全通过

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