feat(trajectory): 接通 fusion-trainer, 补齐飞轮最后一公里 (export → train) - #62
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新增 train 子命令: export 产出 .jsonl 后直接喂给 fusion-trainer CLI。 - src/services/trajectory/trainerCli.ts: execa 封装 fusion-trainer 子进程, format→method 映射 - src/cli/handlers/trajectory.ts: train 分支 + --model/--config/--output-dir Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Closes #61
改动
新增
trajectory train子命令，补齐collect → export → **train** → manifest → list闭环。src/services/trajectory/trainerCli.ts（新增）：用execa（已有依赖 ^9.6.1）封装同仓.venv的fusion-trainer子进程，format → method映射（sft→sft，dpo/grpo→rlsl --method），透传 stdio，返回退出码。src/cli/handlers/trajectory.ts：新增train分支，先按export同构产出.jsonl，再调用runTrainerCli；新增--model/--config/--output-dir；更新usage()。验证
bun run build通过（5272 modules，编译产出./fusion-code）。本仓无测试/lint 配置。约束
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