feat(dlp): add enforcement — USB write-block, print cancel, clipboard clear

Phase 2.5: when DLP policy rule has action="block", the collector
now actively prevents the action instead of just logging:

- USB: Set-Disk -IsReadOnly via Get-Partition/Get-Disk pipeline
- Print: Remove-CimInstance Win32_PrintJob for matching jobs
- Clipboard: Set-Clipboard -Value $null to clear sensitive content

Each enforcement adds enforced=true/false to incident telemetry.
Windows balloon notification shown to user on every block action.
Backward-compatible: existing action="alert" rules unchanged.

Co-Authored-By: Fashion Lisa <igor04091968@gmail.com>

docs/dlp-gap-analysis.md

@@ -32,6 +32,15 @@
 - File-operation telemetry (create/copy/archive/upload hints) — в backlog.
 - Central incident aggregation/export — в backlog.
 
+### Phase 2.5 — Enforcement (внедрено)
+
+- USB write-block (`Set-Disk -IsReadOnly`) при `action: "block"` — внедрено.
+- Print job cancel (`Remove-CimInstance Win32_PrintJob`) при `action: "block"` — внедрено.
+- Clipboard clear (`Set-Clipboard -Value $null`) при `action: "block"` — внедрено.
+- Windows balloon notification пользователю при блокировке — внедрено.
+- Телеметрия enforcement (`enforced: true/false` в incident heartbeat) — внедрено.
+- Документация: `docs/dlp-enforcement.md`.
+
 ### Phase 3
 
 - Policy engine service (server-side), versioned policies, approval workflow.