chore: clean up leftover pfapi references after refactor

- Remove dead test:shard:pfapi script from package.json
- Update AGENTS.md persistence layer path to op-log and sync
- Update documentation file paths in secure-storage.md,
  vector-clocks.md, and quick-reference.md

docs/long-term-plans/secure-storage.md

@@ -164,7 +164,7 @@ async getOrCreateKey(): Promise<CryptoKey> {
 **Modified files:**
 
 - `src/app/core/startup/startup.service.ts` - Call migration in `init()`
-- `src/app/pfapi/api/sync/sync-provider-private-cfg-store.ts` - Add `clear()` method
+- `src/app/sync/providers/private-cfg-store.ts` - Add `clear()` method
 
 **Migration flow:**
 
@@ -240,17 +240,17 @@ async get(key: string): Promise<string | null> {
 
 ### Modified Files (9)
 
-| Path                                                        | Changes             |
-| ----------------------------------------------------------- | ------------------- |
-| `electron/shared-with-frontend/ipc-events.const.ts`         | Add 4 IPC events    |
-| `electron/preload.ts`                                       | Add 4 methods       |
-| `electron/electronAPI.d.ts`                                 | Type definitions    |
-| `electron/ipc-handler.ts`                                   | Register handlers   |
-| `src/app/core/window-ea.d.ts`                               | Frontend types      |
-| `src/app/core/startup/startup.service.ts`                   | Trigger migration   |
-| `src/app/pfapi/api/sync/sync-provider-private-cfg-store.ts` | Add clear()         |
-| `android/app/build.gradle`                                  | Add security-crypto |
-| `android/.../CapacitorMainActivity.kt`                      | Register plugin     |
+| Path                                                | Changes             |
+| --------------------------------------------------- | ------------------- |
+| `electron/shared-with-frontend/ipc-events.const.ts` | Add 4 IPC events    |
+| `electron/preload.ts`                               | Add 4 methods       |
+| `electron/electronAPI.d.ts`                         | Type definitions    |
+| `electron/ipc-handler.ts`                           | Register handlers   |
+| `src/app/core/window-ea.d.ts`                       | Frontend types      |
+| `src/app/core/startup/startup.service.ts`           | Trigger migration   |
+| `src/app/sync/providers/private-cfg-store.ts`       | Add clear()         |
+| `android/app/build.gradle`                          | Add security-crypto |
+| `android/.../CapacitorMainActivity.kt`              | Register plugin     |
 
 ---
 

docs/sync-and-op-log/quick-reference.md

@@ -200,7 +200,7 @@ Conflict detection uses vector clocks to determine causal relationships.
 
 - `vector-clock.service.ts` - Vector clock management
 - `conflict-resolution.service.ts` - Conflict detection logic
-- `src/app/pfapi/api/util/vector-clock.ts` - Clock comparison
+- `src/app/sync/util/vector-clock.ts` - Clock comparison
 
 ---
 
@@ -643,7 +643,7 @@ End-to-end encryption ensures the server never sees plaintext data.
 **Key Files:**
 
 - `operation-encryption.service.ts` - High-level API
-- `pfapi/api/encryption/encryption.ts` - AES-GCM + Argon2id
+- `sync/encryption/encryption.ts` - AES-GCM + Argon2id
 - `operation-log-upload.service.ts` - Encryption during upload
 - `operation-log-download.service.ts` - Decryption during download
 

docs/sync-and-op-log/vector-clocks.md

@@ -71,15 +71,14 @@ This leads to false conflicts where user intervention is required even though on
 ### File Structure
 
 ```
-src/app/pfapi/api/
-├── util/
-│   ├── vector-clock.ts          # Core vector clock operations
-│   ├── backwards-compat.ts      # Migration helpers
-│   └── get-sync-status-from-meta-files.ts  # Sync status detection
-├── model-ctrl/
-│   └── meta-model-ctrl.ts       # Updates vector clocks on changes
-└── sync/
-    └── sync.service.ts          # Integrates vector clocks in sync flow
+src/app/
+├── sync/                        # Sync providers and utilities
+│   ├── util/
+│   │   └── vector-clock.ts      # Core vector clock operations
+│   └── providers/               # WebDAV, Dropbox, SuperSync, etc.
+└── op-log/                      # Operation log system
+    └── sync/
+        └── vector-clock.service.ts  # Vector clock management for op-log
 ```
 
 ### Core Operations
@@ -255,8 +254,8 @@ See the operation log architecture docs for detailed diagrams of this late-joine
 ### Enable Verbose Logging
 
 ```typescript
-// In pfapi/api/util/log.ts, set log level to 2 or higher
-pfLog(2, 'Vector clock comparison', {
+// In op-log/util/log.ts, set log level to 2 or higher
+opLog(2, 'Vector clock comparison', {
   localVector: vectorClockToString(localVector),
   remoteVector: vectorClockToString(remoteVector),
   result: comparison,