58 lines
1.8 KiB
Markdown
58 lines
1.8 KiB
Markdown
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# T041 — 候選判定與品質計數
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> Status: `done`
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> Milestone: `M4`
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> Est. change: `~190 lines`
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## Goal
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完成後，每個 raw candidate 都只經一條可測管線產生 eligible／duplicate／irrelevant 等判定與 match reason。
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## Depends on
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- T040
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## Inputs
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- 讀取 / 依賴：
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- 檔案：`apps/backend/internal/module/scout/usecase/service.go`、`planner.go`
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- 既有能力 / API：canonicalPermalink、classifyPost、stale rules、TopicSignature
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- Spec 段落：§4 流程 B/C、§2.1
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## Outputs
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### 程式變更（預期路徑）
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| 路徑 | 動作 | 說明 |
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|------|------|------|
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| `apps/backend/internal/module/scout/usecase/candidate.go` | add | 定義 evaluator、decision reason 與 run counters accumulator。 |
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| `apps/backend/internal/module/scout/usecase/service.go` | edit | persist 前改用 evaluator，移除重複散落的 eligibility 判定。 |
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| `apps/backend/internal/module/scout/usecase/candidate_test.go` | add | 覆蓋 URL、空文、stale、signature、classification 與 reason。 |
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### 行為變更
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- score／track 只能補充 reason 與排序權重，不得繞過 topic signature。
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### API / 契約（若有）
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- searched/duplicate/irrelevant/eligible 的計數定義固定且互斥可解釋。
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## Out of scope
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- 不做歷史 identity 查詢或多輪補量。
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## Acceptance
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- [x] 每個 candidate 有唯一終局 decision，eligible reason 含核心命中。
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- [x] 指令：
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```bash
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cd apps/backend && go test ./internal/module/scout/usecase -run Candidate -count=1
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```
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驗收結果：CandidateEvaluator 統一 canonical URL／時效／TopicSignature／分類 gate，產生 eligible、duplicate、irrelevant 與可解釋 reason；既有 product/provider/demand/activity 回歸通過。
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## Notes
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provider/demand 模式既有分類行為必須回歸，不因 activity 改造被放寬。
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