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Pipeline v2 Phase 1, commit 3/4. Cost_Governor reserves each call's worst-case estimate (prompt chars/4 + max_tokens via the #18 pricing chain) against the run ledger row with one atomic conditional UPDATE (the #10 lock discipline) BEFORE dispatch, then settles to actuals after each response; failed calls release their hold. Integrated inside OpenRouter_Provider::send_chat_completion so EVERY text-LLM call path is guarded with zero call-site changes; the image curl_multi batch reserves its summed estimate in Image_Pipeline before generate_image_batch. Breach: run halted (sticky), overage recorded, Cost_Ceiling_Exception aborts the un-dispatched call, process_next_queued_article aborts the remaining queued articles of halted/failed runs, and the Review Queue shows a 'Halted runs' notice (runs halted pre-post have no draft to list). Ceiling = prautoblogger_per_run_cost_ceiling_usd setting (default constant $0.50, snapshotted at run start, 0 = disabled). Standalone no-run calls, the monthly cap, and the AI Gateway path are unchanged. Under-300: provider API-key fetch+validation moved verbatim to OpenRouter_Request_Builder::resolve_api_key(). Agent-Session: pipeline-v2-phase1-engineer-20260612
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