feat(coder,server): audit engine — session audit, guideline compliance, user correction tracking

Implements audit-harness-inspired session lifecycle: audit session
creation/end/recover/report-daily with JSONL buffer and graded context
recovery (L0-L4). Guideline service for behavioral compliance rules
(condition/action model with criticality). Correction service for
persistent user correction tracking across agent sessions.

8 supporting skills: audit-start/end/report-daily/recover + command
variants for slash-command integration.

apps/server/src/services/audit/index.ts

@@ -0,0 +1,68 @@
+export {
+  findRunsDir,
+  ensureRunsDir,
+  readCurrentSession,
+  writeCurrentSession,
+  clearCurrentSession,
+  readIndex,
+  writeIndex,
+  updateIndexEntry,
+  findInProgressSessions,
+  INDEX_SCHEMA_VERSION,
+  GITIGNORE_CONTENT,
+} from './runs-dir.js';
+export type { IndexEntry, IndexFile } from './runs-dir.js';
+
+export {
+  generateSessionId,
+  isoNow,
+  createSession,
+  getSessionDir,
+  getActiveSession,
+  readSession,
+  updateSession,
+  endSession,
+  appendToTrail,
+  readTrail,
+  recoverContext,
+  checkUnfinishedSessions,
+  generateSessionSummary,
+} from './session-manager.js';
+export type { SessionJson, RecoverySummary } from './session-manager.js';
+
+export {
+  createCorrection,
+  findCorrections,
+  checkCorrectionConflict,
+} from './corrections.js';
+export type { UserCorrectionRecord } from './corrections.js';
+
+export {
+  GuidelineDocumentStore,
+} from './guideline-store.js';
+export type {
+  GuidelineId,
+  GuidelineContent,
+  Guideline,
+  Criticality,
+  GuidelineUpdateParams,
+  GuidelineDocument,
+} from './guideline-store.js';
+
+export {
+  JourneyStore,
+} from './journey-store.js';
+export type {
+  JourneyId,
+  JourneyNodeId,
+  JourneyEdgeId,
+  Journey,
+  JourneyNode,
+  JourneyEdge,
+} from './journey-store.js';
+
+export {
+  projectJourneyToGuidelines,
+  detectJourneyBacktrack,
+} from './journey-projection.js';
+export type { ProjectedGuideline, BacktrackCheck } from './journey-projection.js';