## Execution Log

### T1: Add username-only user resource helpers

**Status**: Completed
**Files Changed**:
- `server/router/api/v1/user_resource_name.go`
- `server/router/api/v1/resource_name.go`
- `server/router/api/v1/user_service.go`
- `server/router/api/v1/test/user_resource_name_test.go`
**Validation**: `go test -v ./server/router/api/v1/test -run 'TestUserResourceName'` — PASS
**Path Corrections**: Tightened username-token validation so numeric-only `users/1` fails at the resource-name layer instead of falling through to `NotFound`.
**Deviations**: None

### T2: Migrate user-scoped API handlers

**Status**: Completed
**Files Changed**:
- `server/router/api/v1/user_service.go`
- `server/router/api/v1/shortcut_service.go`
- `server/router/api/v1/user_service_stats.go`
- `server/router/api/v1/test/shortcut_service_test.go`
- `server/router/api/v1/test/user_service_stats_test.go`
- `server/router/api/v1/test/user_notification_test.go`
- `server/router/api/v1/test/user_service_registration_test.go`
**Validation**: `go test -v ./server/router/api/v1/test -run 'Test(ListShortcuts|GetShortcut|CreateShortcut|UpdateShortcut|DeleteShortcut|ShortcutFiltering|ShortcutCRUDComplete|GetUserStats_TagCount|ListUserNotifications|UserRegistration)'` — PASS
**Path Corrections**: Updated test fixtures to use valid username-form resource names (`users/testuser`, `users/test-user`) and corrected one stale registration-name expectation during the later broader suite rerun.
**Deviations**: None

### T3: Migrate memo, reaction, MCP, and avatar user references

**Status**: Completed
**Files Changed**:
- `server/router/api/v1/memo_service_converter.go`
- `server/router/api/v1/memo_service.go`
- `server/router/api/v1/reaction_service.go`
- `server/router/mcp/tools_memo.go`
- `server/router/mcp/tools_attachment.go`
- `server/router/mcp/tools_reaction.go`
- `server/router/fileserver/fileserver.go`
- `server/router/api/v1/test/memo_service_test.go`
- `server/router/api/v1/test/reaction_service_test.go`
**Validation**: `go test ./server/router/api/v1/... ./server/router/mcp/... ./server/router/fileserver/...` — PASS
**Path Corrections**: Removed an unused fileserver import after the first package build failed; kept MCP tool helper signatures stable for undeclared callers and switched tool call sites to username-aware wrappers.
**Deviations**: None

### T4: Update contract docs and regression tests

**Status**: Completed
**Files Changed**:
- `proto/api/v1/user_service.proto`
- `proto/api/v1/shortcut_service.proto`
- `web/src/layouts/MainLayout.tsx`
- `web/src/components/MemoExplorer/ShortcutsSection.tsx`
- `server/router/fileserver/README.md`
**Validation**: `go test -v ./server/router/api/v1/test/...` — PASS
**Path Corrections**: None
**Deviations**: None

## Completion Declaration

All tasks completed successfully