negative-keyword-sweep

## Goal Pull the search-terms report, identify spend that isn't producing, group it intelligently, and add negatives at the right level — without nuking legitimate intent. ## Inputs to confirm (batch) 1. Account name (substring) — required. 2. Scope — single campaign, list of campaigns, or "all Search campaigns" — required. 3. Lookback — default 30 days; user can override (60 / 90). 4. Waste thresholds — defaults; allow override: - **No-converter**: spend ≥ $X over lookback AND 0 conversions. Default $X = 2× target CPA, or $50 if no target. - **Low-CVR offender**: spend ≥ 3× target CPA AND CVR < 25% of account CVR. - **Off-brand / off-intent**: terms that match a denylist of words (e.g. `free`, `jobs`, `careers`, `tutorial`, `review`, `salary`, `download`, `cheap`, `pirate`, `crack`) — calibrated to vertical. 5. Negative scope preference — default behavior: - Recurring junk seen across multiple campaigns → **account-level shared negative list**. - Waste seen only in one campaign → **campaign-level**. - Single-theme misintent (e.g. "free" only hurts a paid product ad group) → **ad-group-level**. - Default match type: **phrase**, except for single-word obvious junk → **broad** isn't an option (negatives have no broad), so use **exact** for single tokens like `free`. ## Workflow 1. **Discover** ops: `gads_select_accounts`, `gads_list_report_fields`, `gads_get_report`, `gads_create_negative_keyword_list`, `gads_attach_negative_list_to_campaigns`, `gad...