feat: Vestige v1.7.0 — 18 tools, automation triggers, SQLite perf

Tool consolidation: 23 → 18 tools
- ingest merged into smart_ingest (single + batch mode)
- session_checkpoint merged into smart_ingest batch (items param)
- promote_memory/demote_memory merged into memory(action=promote/demote)
- health_check/stats merged into system_status

Automation triggers in system_status:
- lastDreamTimestamp, savesSinceLastDream, lastBackupTimestamp,
  lastConsolidationTimestamp — enables Claude to conditionally
  trigger dream/backup/gc/find_duplicates at session start
- Migration v6: dream_history table (dreams were in-memory only)
- DreamHistoryRecord struct + save/query methods
- Dream persistence in dream.rs (non-fatal on failure)

SQLite performance:
- PRAGMA mmap_size = 256MB (2-5x read speedup)
- PRAGMA journal_size_limit = 64MB (prevents WAL bloat)
- PRAGMA optimize = 0x10002 (fresh query planner stats on connect)
- FTS5 segment merge during consolidation (20-40% keyword boost)
- PRAGMA optimize during consolidation cycle

1,152 tests passing, 0 failures, release build clean.

crates/vestige-mcp/src/tools/feedback.rs

@@ -280,7 +280,7 @@ pub async fn execute_request_feedback(
                 "description": "Give Claude a custom instruction (e.g., 'update this memory', 'merge with X', 'add tag Y')"
             }
         ],
-        "instruction": "PRESENT THESE OPTIONS TO THE USER. If they choose A, call promote_memory. If B, call demote_memory. If C, they will provide a custom instruction - execute it (could be: update the memory content, delete it, merge it, add tags, research something, etc.)."
+        "instruction": "PRESENT THESE OPTIONS TO THE USER. If they choose A, call memory(action='promote'). If B, call memory(action='demote'). If C, they will provide a custom instruction - execute it (could be: update the memory content, delete it, merge it, add tags, research something, etc.)."
     }))
 }