🥉 [SR-MEM-00] memory-types — anti-amnesia foundation (GOLD IV bottom) #449

Soul-name: Memory Mason · Codename: LEAD · Priority: P2-MEDIUM · Kingdom: Rust
Ring: GOLD IV trios-agent-memory / SR-MEM-00 (bottom of GOLD IV)
Part of: #446
Blocks: SR-MEM-01..06, BR-OUTPUT(GOLD IV)
Blocked by: —

Goal

Define dependency-free types for the agent-memory layer that addresses agent amnesia. Backed by existing infrastructure: zig-knowledge-graph, crates/trios-kg, crates/trios-igla-race/src/lessons.rs, and the HDC episodic agents in crates/trios-sacred/src/phi-engine/hdc/.

Acceptance criteria

• crates/trios-agent-memory/ GOLD scaffold (RING.md, Cargo.toml, src/lib.rs facade ≤ 50 LoC).
• crates/trios-agent-memory/rings/SR-MEM-00/ with README.md, TASK.md, AGENTS.md, Cargo.toml, src/lib.rs (I5).
• Deps: serde + serde_json + uuid + chrono + sha2 only.
• Public types: TripleId([u8; 32]), Provenance { agent_id, task_id, source_sha, ts }, enum AgentRole { Scarab, Gardener, Trainer, Doctor, Claude, Lead }, enum MemoryKind { Working, Session, LongTerm, Episodic, Semantic }, enum ForgetPolicy { GdprByAgent(AgentRole), AgeOlderThan(Duration), PredicateMatches(String) }, Triple { subject, predicate, object, provenance }.
• TripleId::from_triple() is content-addressed (SHA-256 of subject + predicate + object), proven idempotent in tests.
• Roundtrip JSON tests for every type.
• cargo test -p trios-agent-memory-sr-mem-00 --no-deps green in < 5 s.
• PR closes this issue, Agent: LEAD trailer.

Notes

• See findings on existing memory primitives: lessons.rs (8 KB Neon-backed lesson store with Avoid/Pattern/Winner/Warn/Info types), hdc/rl_agent_memory.zig (replay buffer), hdc/streaming_memory.zig.

🌻 phi² + phi⁻² = 3