Part index (shared reference)

The canonical list of parts and their topic counts. This is a quick reference for agents and contributors; the authoritative per-topic manifest is spec/structure.md at the repository root.

Part	Title	Topics (including the N.0 introduction)
1	Foundations of Measurement	7
2	Flow Metrics	11
3	Developer Experience and the SPACE Framework	8
4	Code and Quality Metrics	7
5	Product and Business Metrics	6
6	Reliability, Operations, and Security Metrics	5
7	Metrics in the Age of AI	5
8	Building a Metrics Program	6
9	Appendices	8

Total: 9 parts, 63 topics.