Refine Statsbomb case study with topological dependency layers and real-time collaboration diagram

- Add topological dependency layer annotations to DSL rules (Layer 1/2/3 showing derivation hierarchy)
- Add shot-complete rule to soccer examples (distinguishes on-target from blocked shots)
- Reorder rules by dependency layers for clarity (atomic derivatives first, then aggregations)
- Add real-time concurrent collection diagram showing GraphQL subscription pub-sub pattern
- Update phase state machine to clarify only Layer 0 atomic events drive phase transitions
- Rename "carry phase" to "possession phase" for accuracy (carry is derived, not a phase)
- Streamline Problem and Impact sections (remove redundant explanatory text)
- Improve domain clarity: event storming domains listed explicitly, metadata temporal stages emphasized
- Fix quantitative results: 16 sequential hours → 4 man-hours during live match with ~20s latency

Author: saadshahd