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/mod.rs

@@ -8,7 +8,6 @@
 
 // Active unified tools
 pub mod codebase_unified;
-pub mod ingest;
 pub mod intention_unified;
 pub mod memory_unified;
 pub mod search_unified;
@@ -22,7 +21,6 @@ pub mod timeline;
 pub mod maintenance;
 
 // v1.3: Auto-save and dedup tools
-pub mod checkpoint;
 pub mod dedup;
 pub mod importance;
 
@@ -35,6 +33,8 @@ pub mod restore;
 // Deprecated tools - kept for internal backwards compatibility
 // These modules are intentionally unused in the public API
 #[allow(dead_code)]
+pub mod checkpoint;
+#[allow(dead_code)]
 pub mod codebase;
 #[allow(dead_code)]
 pub mod consolidate;
@@ -43,6 +43,8 @@ pub mod context;
 #[allow(dead_code)]
 pub mod feedback;
 #[allow(dead_code)]
+pub mod ingest;
+#[allow(dead_code)]
 pub mod intentions;
 #[allow(dead_code)]
 pub mod knowledge;