feat: add notification-threshold rollback preview

Author: Jacobinwwey

docs/brainstorms/2026-04-16-mainline-ci-stabilization-and-m7-direction-requirements.md

@@ -721,7 +721,7 @@ Deliverables:
 - The main remaining gap is not another new route family.
   The next high-leverage gap is operator safety around rollback preview and drift visibility before applying or resetting thresholds.
 
-### M7.23 (Next): Notification-Threshold Rollback Preview and Drift-Diff Governance (Lane Ops Bridge)
+### M7.23 (Now): Notification-Threshold Rollback Preview and Drift-Diff Governance (Lane Ops Bridge)
 
 Deliverables:
 
@@ -756,6 +756,58 @@ Suggested verification slice:
 - `npm run docs:diataxis:check`
 - `npm run docs:site:build`
 
+#### M7.23 Progress Note (2026-04-16)
+
+- [Done] expanded `src/server.ts` with preview route:
+  - `GET /api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds/preview`.
+- [Done] added deterministic rollback-preview helper stack:
+  - `buildAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdPreview(...)`,
+  - `areAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdPoliciesEquivalent(...)`.
+- [Done] preview payload now exposes bounded operator review surfaces:
+  - `activeThresholds`,
+  - `defaultThresholds`,
+  - `driftDiff.activeVsDefault`,
+  - `driftDiff.activeVsLatestAuditPrevious`,
+  - `preview.resetToDefault`,
+  - `preview.rollbackToPrevious`.
+- [Done] latest-audit-linked rollback semantics are now explicit:
+  - rollback-to-previous preview is only marked available when current active thresholds still match the latest audited `nextThresholds`,
+  - otherwise the surface remains read-only and deterministic without auto-rollback behavior.
+- [Done] expanded evidence coverage:
+  - `src/server.migration.test.ts` now validates preview route semantics, default-vs-active drift deltas, latest-audit rollback preview deltas, and reset-preview deltas.
+  - `src/knowledge.api.contract.test.ts`, `src/agent_workspace.verification.contract.test.ts`, and `scripts/verify-agent-workspace-runtime.js` now fail fast on preview-route and helper drift.
+- [Done] verification evidence:
+  - `npm test -- src/server.migration.test.ts --runInBand --testNamePattern "escalation notification threshold rollback preview and drift-diff governance stay deterministic"`
+  - `npm run test:agent-workspace:contracts`
+  - `npm run verify:agent-workspace:runtime`
+  - `npm run docs:diataxis:check`
+  - `npm run docs:site:build`
+
+### Post-M7.23 Architecture Judgment
+
+- L5 governance now has enough visibility for safe operator inspection of notification threshold state transitions.
+- Current weak point shifts from visibility to controlled execution:
+  - operators can preview reset/rollback consequences,
+  - operators still cannot apply a bounded rollback target with explicit preview fingerprinting.
+- Best next increment is not broader governance expansion.
+  Best next increment is explicit rollback execution guardrails on top of the preview surface.
+
+### M7.24 (Next): Notification-Threshold Rollback Apply Guardrails (Lane Ops Bridge)
+
+Deliverables:
+
+- add explicit operator apply route for rollback-to-default or rollback-to-previous-preview targets.
+- require preview fingerprint or audit-linked target metadata so apply semantics cannot drift from what operators reviewed.
+- keep scope limited to notification-threshold governance; do not reopen wider remediation or UI work.
+
+Suggested verification slice:
+
+- `npm test -- src/server.migration.test.ts --runInBand --testNamePattern "notification threshold rollback apply guardrails"`
+- `npm run test:agent-workspace:contracts`
+- `npm run verify:agent-workspace:runtime`
+- `npm run docs:diataxis:check`
+- `npm run docs:site:build`
+
 ## Success Criteria
 
 - CI failure mode that previously blocked the three agent-workspace suites is eliminated on mainline.
@@ -765,4 +817,4 @@ Suggested verification slice:
 
 ## Next Step
 
-Proceed to `/prompts:ce-plan` using this document as the source for `M7.23` decomposition (notification-threshold rollback preview and drift-diff governance), while preserving M7 lane boundary constraints.
+Proceed to `/prompts:ce-plan` using this document as the source for `M7.24` decomposition (notification-threshold rollback apply guardrails), while preserving M7 lane boundary constraints.

docs/diataxis/en/explanation/development-progress-dashboard.md

@@ -599,34 +599,29 @@ Execution anchor:
   - `npm run test:agent-workspace:contracts`
   - `npm run verify:agent-workspace:runtime`
 
-## Latest Mainline Increment (2026-04-16 M7.22 Notification Threshold Overrides and Audit-Trail Governance Lane)
-
-- Expanded `src/server.ts` with notification-threshold governance routes:
-  - `GET /api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds`,
-  - `POST /api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds`,
-  - `GET /api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds/audit?limit=...`.
-- Added file-backed override governance artifacts:
-  - `runtime_data/agent_workspace_diagnostics/triage_remediation_escalation_notification_thresholds.v1.json`,
-  - `runtime_data/agent_workspace_diagnostics/triage_remediation_escalation_notification_thresholds_audit.v1.json`.
-- Hardened notification governance hydration:
-  - `/triage/remediation/escalation/notification-policy` now returns override-backed `anomalyThresholdPolicy`,
-  - `/triage/remediation/escalation/notification-slo` now evaluates breach thresholds from persisted overrides.
-- Added bounded audit-trail semantics:
-  - previous/next threshold snapshots,
-  - reset-to-default flag,
-  - operator `source` / `reason`,
-  - per-field delta summaries for suppression count, throttled digest count, and suppressed-to-emitted ratio.
+## Latest Mainline Increment (2026-04-16 M7.23 Notification-Threshold Rollback Preview and Drift-Diff Governance Lane)
+
+- Expanded `src/server.ts` with preview route:
+  - `GET /api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds/preview`.
+- Added deterministic rollback-preview helper stack:
+  - `buildAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdPreview(...)`,
+  - `areAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdPoliciesEquivalent(...)`.
+- Hardened operator visibility without widening scope:
+  - preview payload now exposes `activeThresholds`, `defaultThresholds`, `driftDiff.activeVsDefault`, `driftDiff.activeVsLatestAuditPrevious`, `preview.resetToDefault`, and `preview.rollbackToPrevious`.
+- Added latest-audit-linked rollback semantics:
+  - rollback-to-previous preview is only marked available when current active thresholds still match the latest audited `nextThresholds`,
+  - drift remains read-only when preview and active state no longer align.
 - Expanded executable evidence:
-  - `src/server.migration.test.ts` now validates override POST/GET/reset semantics, SLO behavior under override, audit-route payloads, and persisted file contents.
+  - `src/server.migration.test.ts` now validates preview-route payloads, default-vs-active drift deltas, latest-audit rollback deltas, and reset-preview deltas.
 - Hardened runtime verification gate:
-  - `src/knowledge.api.contract.test.ts`, `src/agent_workspace.verification.contract.test.ts`, and `scripts/verify-agent-workspace-runtime.js` now fail fast on notification-threshold route and helper drift.
+  - `src/knowledge.api.contract.test.ts`, `src/agent_workspace.verification.contract.test.ts`, and `scripts/verify-agent-workspace-runtime.js` now fail fast on notification-threshold preview route and helper drift.
 - Verification evidence:
-  - `npm test -- src/server.migration.test.ts --runInBand --testNamePattern \"escalation notification threshold overrides and audit-trail governance stay deterministic\"`
+  - `npm test -- src/server.migration.test.ts --runInBand --testNamePattern \"escalation notification threshold rollback preview and drift-diff governance stay deterministic\"`
   - `npm run test:agent-workspace:contracts`
   - `npm run verify:agent-workspace:runtime`
 - Next direction judgment:
-  - current bottleneck is rollback visibility, not another broad governance subsystem,
-  - M7.23 should stay bounded to notification-threshold rollback preview and drift-diff governance on top of existing file-backed policy/audit artifacts.
+  - current bottleneck shifts from visibility to controlled rollback execution,
+  - M7.24 should stay bounded to rollback-apply guardrails with preview fingerprinting, not broader governance expansion.
 
 ## Mainline vs Working-Branch Snapshot (2026-04-14)
 
@@ -676,7 +671,7 @@ This dashboard aligns against the following requirement chain:
 | L2 Retrieval | explainable hybrid/vector retrieval + governance | Expanded in branch-oriented plans | Mainline file-backed baseline only (`src/learning/store.ts`) | Re-enter lane after concrete module evidence lands on mainline |
 | L3 Learning | mastery diagnostics + path/session loop | Expanded in branch | Partially integrated | Contract and integration parity |
 | L4 Interaction | agent conversation + focus/path pane runtime | Implemented in branch | M1-M4 baseline integrated on mainline | Expand capability surface via typed contract only |
-| L5 Governance | runbook, diagnostics, replay/autonomy controls | Expanded in branch | Operator diagnostics persistence/triage/history/threshold governance + runbook automation/audit + adaptive simulation/remediation + remediation backtest/approval-gate + approval-policy hardening/regression-alarms + approval-policy drift/escalation + escalation acknowledgement lifecycle/audit + escalation SLA/reminder baseline + notification digest/suppression baseline + delivery-log observability + stale-cleanup health auditing + anomaly/retention governance + notification SLO governance + notification-threshold override/audit governance integrated | M7.23: notification-threshold rollback preview and drift-diff governance |
+| L5 Governance | runbook, diagnostics, replay/autonomy controls | Expanded in branch | Operator diagnostics persistence/triage/history/threshold governance + runbook automation/audit + adaptive simulation/remediation + remediation backtest/approval-gate + approval-policy hardening/regression-alarms + approval-policy drift/escalation + escalation acknowledgement lifecycle/audit + escalation SLA/reminder baseline + notification digest/suppression baseline + delivery-log observability + stale-cleanup health auditing + anomaly/retention governance + notification SLO governance + notification-threshold override/audit governance + rollback preview/drift-diff governance integrated | M7.24: notification-threshold rollback apply guardrails |
 
 ## Verification Baseline
 

docs/diataxis/zh/explanation/development-progress-dashboard.md

@@ -601,34 +601,29 @@
   - `npm run test:agent-workspace:contracts`
   - `npm run verify:agent-workspace:runtime`
 
-## 主线最新增量（2026-04-16 M7.22 通知阈值覆盖与审计轨迹治理链路）
-
-- 已在 `src/server.ts` 增加通知阈值治理路由：
-  - `GET /api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds`，
-  - `POST /api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds`，
-  - `GET /api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds/audit?limit=...`。
-- 已补 file-backed 覆盖治理产物：
-  - `runtime_data/agent_workspace_diagnostics/triage_remediation_escalation_notification_thresholds.v1.json`，
-  - `runtime_data/agent_workspace_diagnostics/triage_remediation_escalation_notification_thresholds_audit.v1.json`。
-- 已加固通知治理链路的覆盖态读取：
-  - `/triage/remediation/escalation/notification-policy` 现在返回基于持久化覆盖的 `anomalyThresholdPolicy`，
-  - `/triage/remediation/escalation/notification-slo` 现在基于持久化覆盖阈值计算 breach。
-- 已增加有界审计轨迹语义：
-  - `previousThresholds` / `nextThresholds` 快照，
-  - `resetToDefault` 标记，
-  - operator `source` / `reason`，
-  - suppression count、throttled digest count 与 suppressed-to-emitted ratio 的逐字段 delta 摘要。
+## 主线最新增量（2026-04-16 M7.23 通知阈值回滚预览与 drift-diff 治理链路）
+
+- 已在 `src/server.ts` 增加预览路由：
+  - `GET /api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds/preview`。
+- 已增加确定性回滚预览 helper 栈：
+  - `buildAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdPreview(...)`，
+  - `areAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdPoliciesEquivalent(...)`。
+- 已在不扩 scope 前提下补足 operator 可见性：
+  - 预览载荷现在输出 `activeThresholds`、`defaultThresholds`、`driftDiff.activeVsDefault`、`driftDiff.activeVsLatestAuditPrevious`、`preview.resetToDefault` 与 `preview.rollbackToPrevious`。
+- 已增加 latest-audit-linked rollback 语义：
+  - 仅当当前 active thresholds 仍与最新审计记录的 `nextThresholds` 对齐时，rollback-to-previous preview 才标记为可用，
+  - 否则只暴露只读 drift 信息，不做隐式回滚。
 - 已补可执行证据：
-  - `src/server.migration.test.ts` 新增 override POST/GET/reset、覆盖后 SLO 行为、audit 路由语义与持久化文件内容断言。
+  - `src/server.migration.test.ts` 新增 preview 路由载荷、default-vs-active drift delta、latest-audit rollback delta 与 reset preview delta 断言。
 - 已加固 runtime 门禁：
-  - `src/knowledge.api.contract.test.ts`、`src/agent_workspace.verification.contract.test.ts` 与 `scripts/verify-agent-workspace-runtime.js` 新增 notification-threshold 路由与 helper 的 fail-fast 断言。
+  - `src/knowledge.api.contract.test.ts`、`src/agent_workspace.verification.contract.test.ts` 与 `scripts/verify-agent-workspace-runtime.js` 新增 notification-threshold preview 路由与 helper 的 fail-fast 断言。
 - 验证证据：
-  - `npm test -- src/server.migration.test.ts --runInBand --testNamePattern \"escalation notification threshold overrides and audit-trail governance stay deterministic\"`
+  - `npm test -- src/server.migration.test.ts --runInBand --testNamePattern \"escalation notification threshold rollback preview and drift-diff governance stay deterministic\"`
   - `npm run test:agent-workspace:contracts`
   - `npm run verify:agent-workspace:runtime`
 - 后续方向判断：
-  - 当前瓶颈是回滚可见性，不是继续扩一个更大的治理子系统，
-  - M7.23 应继续收敛在 notification-threshold rollback preview 与 drift-diff 治理，复用现有 file-backed policy/audit 产物。
+  - 当前瓶颈从可见性转向受控执行，
+  - M7.24 应继续收敛在 rollback apply guardrails 与 preview fingerprinting，不要扩成更大的治理子系统。
 
 ## 主线 vs 工作分支快照（2026-04-14）
 
@@ -678,7 +673,7 @@
 | L2 检索层 | 可解释混合/向量检索 + 治理 | 分支规划增强中 | 主线当前为 file-backed 基线（`src/learning/store.ts`） | 待主线出现对应模块证据后再收敛 |
 | L3 学习层 | 掌握诊断 + 路径/会话闭环 | 分支增强中 | 主线部分集成 | 契约与集成一致性 |
 | L4 交互层 | agent 对话 + focus/path pane 运行时 | 分支已实现 | 主线 M1-M4 已落入基线 | 继续通过 typed contract 扩展动作面 |
-| L5 治理层 | runbook/诊断/回放与自动化 | 分支增强中 | 主线已集成运维诊断持久化/分级/趋势历史/阈值治理 + runbook 自动化/阈值审计 + 自适应模拟/自动修复 + 回测/批准门禁 + 批准策略硬化/回归告警 + 批准策略漂移/升级 + 升级确认生命周期/审计 + 升级 SLA/提醒基线 + 通知摘要/抑制基线 + 交付日志可观测性 + 陈旧通知健康审计 + 异常/retention 治理 + 通知 SLO 治理 + 通知阈值覆盖/审计治理 | M7.23：通知阈值回滚预览与 drift-diff 治理 |
+| L5 治理层 | runbook/诊断/回放与自动化 | 分支增强中 | 主线已集成运维诊断持久化/分级/趋势历史/阈值治理 + runbook 自动化/阈值审计 + 自适应模拟/自动修复 + 回测/批准门禁 + 批准策略硬化/回归告警 + 批准策略漂移/升级 + 升级确认生命周期/审计 + 升级 SLA/提醒基线 + 通知摘要/抑制基线 + 交付日志可观测性 + 陈旧通知健康审计 + 异常/retention 治理 + 通知 SLO 治理 + 通知阈值覆盖/审计治理 + 回滚预览/drift-diff 治理 | M7.24：通知阈值回滚 apply guardrails |
 
 ## 验证基线
 

scripts/verify-agent-workspace-runtime.js

@@ -160,6 +160,10 @@ function verifyAgentWorkspaceRuntime(repoRoot = path.resolve(__dirname, '..')) {
     serverSource.includes('/api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds'),
     'Missing diagnostics remediation escalation notification-threshold route in src/server.ts'
   );
+  assert(
+    serverSource.includes('/api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds/preview'),
+    'Missing diagnostics remediation escalation notification-threshold preview route in src/server.ts'
+  );
   assert(
     serverSource.includes('/api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds/audit'),
     'Missing diagnostics remediation escalation notification-threshold audit route in src/server.ts'
@@ -340,6 +344,10 @@ function verifyAgentWorkspaceRuntime(repoRoot = path.resolve(__dirname, '..')) {
     serverSource.includes('appendAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdAuditEntry'),
     'Missing remediation escalation notification threshold audit writer in src/server.ts'
   );
+  assert(
+    serverSource.includes('buildAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdPreview'),
+    'Missing remediation escalation notification threshold preview helper in src/server.ts'
+  );
   assert(
     serverSource.includes('buildAgentWorkspaceDiagnosticsRemediationEscalationNotificationAnomalyReport'),
     'Missing remediation escalation notification anomaly report helper in src/server.ts'

src/agent_workspace.verification.contract.test.ts

@@ -63,6 +63,7 @@ describe('agent workspace verification script contracts', () => {
     expect(runtimeSource).toContain('/api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/sla');
     expect(runtimeSource).toContain('/api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/reminders');
     expect(runtimeSource).toContain('/api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds');
+    expect(runtimeSource).toContain('/api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds/preview');
     expect(runtimeSource).toContain('/api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-thresholds/audit');
     expect(runtimeSource).toContain('/api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notification-policy');
     expect(runtimeSource).toContain('/api/knowledge/operator/agent-workspace-diagnostics/triage/remediation/escalation/notifications');
@@ -107,6 +108,7 @@ describe('agent workspace verification script contracts', () => {
     expect(runtimeSource).toContain('persistAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdPolicy');
     expect(runtimeSource).toContain('readAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdAuditTrail');
     expect(runtimeSource).toContain('appendAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdAuditEntry');
+    expect(runtimeSource).toContain('buildAgentWorkspaceDiagnosticsRemediationEscalationNotificationThresholdPreview');
     expect(runtimeSource).toContain('buildAgentWorkspaceDiagnosticsRemediationEscalationNotificationSloReport');
     expect(runtimeSource).toContain('applyAgentWorkspaceDiagnosticsRemediationEscalationReminderSuppressionPolicy');
     expect(runtimeSource).toContain('buildAgentWorkspaceDiagnosticsRemediationEscalationGovernanceContext');