[MetaROR] Ch2 Understanding Replications & Reproductions — author revisions

Author revisions for **Chapter 2 (Understanding Replications and Reproductions)** from the MetaROR reviews (R1, R2, R3).

- [x] Consider adding many-analyst study findings alongside the Landy et al. discussion. (R1) (in #39)

**Handled in other issues:**
- Table 2.1 — "possible interpretations" and introducing "generalizable" (reviewer conflict R1↔R2) → *Points for discussion*
- Reorder Sections 2.3/2.4, rename the chapter, integrate 2.3/2.4 into Chapter 4, merge Chapter 1 into Chapter 2 → *Structural reorganisation & scope*
- Balance reproduction coverage (move Table 4.1 classification earlier) → *Content gaps*

The issue names Chapter 2 but no source file, test, or entry point. Start by locating the chapter source and reviewing the MetaROR items, especially #39 and the referenced structural and content issues; done means the outstanding revisions are explicitly addressed or tracked in the appropriate issue.

Written by the indexing model from the issue text.