🥉 [SR-00] scarab-types — dep-free serde primitives (GOLD I bottom) #448

Soul-name: Scarab Smith · Codename: LEAD · Priority: P1-HIGH · Kingdom: Rust
Ring: GOLD I trios-igla-race-pipeline / SR-00 (bottom of GOLD I)
Part of: #446
Blocks: SR-01, SR-02, SR-03, SR-04, SR-05, BR-OUTPUT
Blocked by: —

Goal

Extract dependency-free typed primitives from the monolith crates/trios-igla-race/src/{neon.rs,status.rs,schema/igla_race.sql} into a serde-only ring. This is the foundation for every other GOLD I ring.

Acceptance criteria

• crates/trios-igla-race-pipeline/ GOLD scaffold exists (RING.md, Cargo.toml, src/lib.rs facade ≤ 50 LoC).
• crates/trios-igla-race-pipeline/rings/SR-00/ contains README.md, TASK.md, AGENTS.md, Cargo.toml, src/lib.rs (I5).
• Cargo deps: serde + serde_json + uuid + chrono only (no tokio, no sqlx, no reqwest).
• Public types: Scarab, Heartbeat, JobId, BpbSampleRow, WorkerId, Seed, JobStatus, StrategyId.
• All types serialize/deserialize via JSON roundtrip and match schema/igla_race.sql columns 1:1.
• Backward-compat re-exports kept in crates/trios-igla-race/src/neon.rs and src/status.rs so the live fleet keeps building.
• Unit tests: roundtrip + .sql schema parity (compile-time assertion table-test).
• cargo test -p trios-igla-race-pipeline-sr-00 --no-deps green in < 5 s.
• cargo clippy -- -D warnings clean.
• PR closes this issue (L2), Agent: LEAD trailer (L14).
• .trinity/experience/ line written (L7).

Notes

• I-SCOPE: only files under crates/trios-igla-race-pipeline/ and the two backward-compat re-exports in crates/trios-igla-race/src/{neon.rs,status.rs}.
• Source files of types: crates/trios-igla-race/src/neon.rs, status.rs, schema/igla_race.sql.

🌻 phi² + phi⁻² = 3