[R1] SR-00 scarab-types — Parallel Execution Foundation

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Overview

Break down monolith scarabs unit into 5 atomic rings (SR-00 through SR-04). Enables 5 parallel agents to start simultaneously via trinity-bootstrap --codename (PR #469).

Rings

Ring	Scarab Types	Total
SR-00	scarab-types	1
SR-01	scarab-lane	1
SR-02	scarab-soul	1
SR-03	scarab-gate	1
SR-04	scarab-gate	1
Total	5

Ring Structure

Each ring exports a ScarabType enum for that ring's scarab category:

SR-00: scarab-types (Ring-Pattern Refactor R1)

• 16 Term enum variants (O-Type through Nine-Type)
• Each term implements Display with as_markdown() method
• README.md explaining term taxonomy
• Tests: 3/3 passed, clippy 0 warnings

SR-01: scarab-lane (R1-02)

• Combines O-Type + Two-Type for lane-level agents
• LaneScarabType struct with LaneScarabType variant

SR-02: scarab-soul (R1-03)

• Combines O-Type + Three-Type for soul-level agents
• SoulScarabType struct with SoulScarabType variant

SR-03: scarab-gate (R1-04)

• Combines O-Type + Four-Type for gate-level agents
• GateScarabType struct with GateScarabType variant

SR-04: scarab-gate (R1-05)

• Combines O-Type + Five-Type for gate-level agents
• GateScarabType struct with GateScarabType variant (duplicate ring for validation)

Acceptance Criteria

• SR-00 scarab-types crate created
• Each ring exports ScarabType enum with at least 3 variants
• Each term implements Display with as_markdown() method
• README.md exists in each ring explaining term taxonomy
• cargo clippy --all-targets = 0 warnings
• cargo test --all = 100% pass (3 tests)
• Committed with Agent: Constitutional Cartographer trailer

Part of #446 — Ring-Pattern Refactor (3 GOLD ~19 SR)