collection_tools 0.42.0

# collection_tools Task Management

Work items for the collection_tools crate.

## Responsibility Table

| Entry | Responsibility |
|-------|----------------|
| `backlog/` | Tasks reviewed but not yet promoted to active |
| `completed/` | Tasks that passed validation and are complete |

## Tasks Index

| Order | ID | Advisability | Value | Easiness | Safety | Priority | Status | Executor | Task | Purpose |
|-------|----|--------------|-------|----------|--------|----------|--------|----------|------|---------|
| 1 | 001 | 504 | 4 | 7 | 9 | 2 | 📥 (Backlog) | any | [Explore type-checking marker traits](backlog/001_explore_type_checking_marker_traits.md) | Evaluate and prototype marker traits for collection type checks via `implements!` |
| 2 | 002 | 0 | 7 | 6 | 9 | 0 | ✅ | any | [Wire and verify compile-fail test infrastructure](completed/002_wire_compile_fail_tests.md) | Verify FT-02/FT-06/FT-07/AP-09 compile-fail tests pass Level 3 |

## Statistics

- **Total Tasks:** 2
- **Active:** 0
- **Completed:** 1
- **Backlog:** 1