53 lines
1.7 KiB
Markdown
53 lines
1.7 KiB
Markdown
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# T743 — product fit ai structured fallback
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> Status: `done`
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> Milestone: `M4` · Phase C
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> Kind: `feat` · Est. change: `~190 lines`
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## Goal
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產品適配優先使用結構化 AI 判定，輸出不完整時安全回 deterministic scorer，不保存腦補證據。
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## Depends on
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- T741、T742
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## Inputs
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- `apps/backend/internal/module/radar/usecase/judge.go`、AI provider abstraction
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- `../spec.md` §3.2、§8
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## Outputs
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| 路徑 | 動作 | 說明 |
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|------|------|------|
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| `apps/backend/internal/module/radar/usecase/product_fit_ai.go` | add | prompt、JSON parse、evidence validation、fallback |
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| `apps/backend/internal/module/radar/usecase/judge.go` | edit | product mode 接 fit；generic 保留舊 fit |
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| AI tests | add | valid／missing dimensions／invented excerpt／provider failure |
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## Behavior
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- excerpt 必須可在候選文字找到；basis 必須可在 snapshot 找到。
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- AI 結果缺契約即丟棄，fallback 仍需四維完整。
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- 新 match 計 `ai_research`／`radar.product_fit`；既有 generic 計費不變。
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## Out of scope
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- merge 與 primary（T744）
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- 準確度樣本（T773）
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## Acceptance
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- [x] provider failure 不產生空 reasons，且 token 不當會員 auth。
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```bash
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cd apps/backend && go test ./internal/module/radar/usecase/... -count=1
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```
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Implementation result (2026-08-10): product watches now attach a structured
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four-dimension fit during judging and meter it as `ai_research`／
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`radar.product_fit`. AI output is accepted only when every positive excerpt is
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found in the candidate and every basis exists in the immutable snapshot;
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malformed, invented, or provider-failed responses fall back to T742's
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deterministic scorer, preserving complete reasons and hard exclusions.
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