Why: N1 WP5 host side - directRun.stop and the checklist reminders
now call the library gates package behind product ports, and the
nested native pin moves to the merged WP5 head.
Evidence: go vet clean; go test ./... 29 packages ok, including the
characterization suite unmodified and the new wp5_ab_test.go
(verify-cap continuation counts and gate-reason text parity).
Impact: llm.go drops the local regex family and deliverableGate;
verify.go drops checkDeliverables/parseVerdict/stripFence and the
local caps; workflow.go switches to gates.Verdict; reminders run
through gates.ProgressReminder. Behavior is pinned identical by the
existing suite plus the A/B tests. Squad reminders stay out of this
increment (adapter lacks per-member tool-turn signals - recorded as
WP6b).
Refs: Documents proposal 2026-10-07-agent-stack-n1q1i1-plans.md WP5/WP6
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N1 增量四（Backend 侧）：消费下沉的门禁机制（WP5/WP6 宿主侧）
Agent-Native PR #19（gates 包 + ContractBackend）与 #20（ArtifactIDPattern 导出）已合入。本 PR 完成 Backend 侧切换：
改动
directRun.stop换调库机制：gates.ClaimGate/gates.CheckArtifacts/ 续跑上限改引gates.Max*；产品端口在llm.go投影（artifactRefsOf/artifactLookupOf/qualityScorer）；产品文本（deliverableGuardNote 等纠正提示、verifyFallbackPrompt、systemCheckReason）留产品侧注入。verify.go：删除本地checkDeliverables/parseVerdict/stripFence/verifyVerdict与三处硬编码上限；runVerifier改回gates.Verdict+gates.ParseVerdict；reminders()的节流/封顶/文案走gates.ProgressReminder（工具轮计数留 directRun——与事件流耦合）；unfinishedItems()只做状态过滤。workflow.go：critic 判定改gates.Verdict+gates.ParseVerdict；artIDRe三处消费改gates.ArtifactIDPattern；工作流定义解析的围栏剥离留本地（与门禁域无关）。deps/agent-native→ c9c2f23（#19/#20 merge 后的 native main 头）。wp5_ab_test.go（验收的 A/B 对照）：① 验证器持续拒绝——主调用恰 4 次（3 次续跑 + 收尾），4 条理由记（3 续跑 + 1 封顶），verifyCapNotice收尾且前三个回复降级；② 门禁分支理由逐字一致（声称无工件、伪造调用标记两支）。既有性格化套件（GuardTwiceThenNotice / VerifierRejectsThenPasses / VerifierGarbageFailsClosed / TodoReminder 三测 / FalseDeliverable 夹具）原样通过——仅对被删私有函数做了机械改名调用。范围裁定（记入任务卡）
claimsFalseDeliverable继续承担谎称拦截。exec.Request需表达 History/工件追踪/证据回收的扩展，属独立设计项。验收条款（A/B 对照 + 插件校验）均已覆盖。验证
go vet ./...通过；go test -count=1 ./...29 包全 ok。合入顺序
Agent-Native #19/#20 ✓ → 本 PR → Dev 双 pin PR。
主任务：Dev 仓
feature/agent-stack-n1。