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T744 — product match merge primary arbitration

Status: done
Milestone: M4 · Phase C
Kind: feat · Est. change: ~200 lines

Goal

把 fit 結果合併進既有 Opportunity，穩定選 PrimaryProduct 並正確換算 intent fit 10 分。

Depends on

T732、T743

Inputs

apps/backend/internal/module/radar/usecase/judge_persist.go
../spec.md §3.3、§4.2

Outputs

路徑	動作	說明
`apps/backend/internal/module/radar/usecase/product_match_merge.go`	add	merge decision、primary arbitration、score recompute
`apps/backend/internal/module/radar/usecase/judge_persist.go`	edit	new／existing／same-product branches
merge tests	add	first／higher／tie／manual override／same product

Behavior

首 eligible 為 primary；更高分自動替換；tie 使用 spec 穩定規則。
有人工 override 不自動替換。
primary 變更只改 fit reason 與總分，不重跑其他四問。
同 Product 再命中只 merge watch／term，不重判不計費。

Out of scope

人工 override API（T754）
list filters（T753）

Acceptance

spec #4–#6 的 usecase tests 通過。

cd apps/backend && go test ./internal/module/radar/usecase/... -count=1

Implementation result (2026-08-10): new and existing opportunities now carry ProductMatch snapshots through persistence. Same-product hits only merge watch／term sources; new eligible products arbitrate primary by score, band, time, and ID, while human overrides are preserved. Primary changes recompute only the existing fit reason and intent total (product fit 0–100 → fit 0–10).

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