tsift-memory

First-party memory substrate for tsift and agent-doc.

This crate owns the stable memory schema, budgeted capture contracts, and migration importers. It treats external memory tools such as claude-mem as import sources instead of durable runtime dependencies.

Current surfaces:

• MemoryStore initializes .tsift/memory.db with schema version 2.
• read_memory_events_with_policy reads bounded memory slices with explicit recent_first, oldest_first, or query_relevant policies, and memory_read_watermark hashes the selected event set plus memory-table high water marks for projection freshness.
• plan_capture_handoff estimates tokens before model calls and reports split/defer decisions.
• guard_memory_handoff fails closed on oversized raw payloads and emits digest/context replacements plus retryable chunk commands.
• inspect_claude_mem and read_claude_mem_events inspect the observed claude-mem SQLite schema without writing to it.
• import_claude_mem optionally migrates those events into the tsift memory DB; uncapped imports report per-table source/read/import reconciliation and capped event-id samples so operators can prove all supported rows were covered without oversized JSON.

Graph/RAG behavior lives in tsift-memgraphrag, which depends on this crate for events and imports. tsift-memory does not depend back on MemGraphRAG.