Remove all restore/snapshot references from compaction

- Removed restore command from bd show output
- Updated compact help text (removed snapshot claim)
- Fixed COMPACTION.md (removed 'batch restore' from roadmap)
- All compaction UI now correctly states permanent decay

COMPACTION.md

@@ -447,5 +447,5 @@ Common enhancement requests:
 - Custom summarization prompts (bd-264)
 - Alternative LLM backends (local models)
 - Configurable eligibility rules
-- Batch restore operations
 - Compaction analytics dashboard
+- Optional snapshot retention for restore (if requested)