🥈 [SR-MEM-05] episodic-bridge — lessons.rs + HDC ↔ KG #455

Soul-name: Replay Reaper · Codename: LEAD · Priority: P2-MEDIUM · Kingdom: Rust
Ring: GOLD IV trios-agent-memory / SR-MEM-05
Part of: #446
Blocks: BR-OUTPUT(GOLD IV)
Blocked by: SR-MEM-01 (issue 7)

Goal

Bidirectional bridge between the two existing episodic stores and the KG long-term memory:

• crates/trios-igla-race/src/lessons.rs (Neon-backed Avoid/Pattern/Winner/Warn/Info lessons).
• crates/trios-sacred/src/phi-engine/hdc/rl_agent_memory.zig (HDC replay buffer with forgetting_factor=0.001).

Acceptance criteria

• rings/SR-MEM-05/ with I5 trinity.
• Deps: SR-MEM-00, SR-MEM-01, tokio, sqlx (for Neon NOTIFY listener).
• Bridge::start() subscribes to Neon NOTIFY on the lessons table and forwards each row as a triple via SR-MEM-01.
• HDC forwarder reads streaming_memory.zig exports (FFI binding marked TODO if Zig FFI not yet ready) and emits triples.
• Reverse direction: Bridge::seed_replay(&mut HdcMemory, lookback: Duration) pulls KG triples back into the HDC replay buffer for warm start.
• No write to lessons.rs directly — read-only forwarder (L21 context immutability).
• Smoke test against Neon dev DB.
• PR closes this issue, Agent: LEAD trailer.

🌻 phi² + phi⁻² = 3