v0.7.0

What's new

book-kit spine prints a paperback cover's spine width, full wrap size, and 300 dpi pixel size for each printer, from print.trim and the page count (--pages, then print.page_count, then the built PDF). It warns on an odd page count and when a book is too short for KDP spine text. --json gives machine-readable output. (#18)

Two new print settings go with it:

• print.paper picks KDP's paper (white, cream, standard-color, premium-color). Defaults to white.
• print.caliper adds other printers' paper thickness in inches per page, e.g. { ingramspark: … }. Printers' papers differ, so take the figure from that printer's own cover template.

Other changes

• The Docker image moves to Ubuntu 26 (#16).

Upgrading from 0.6

Nothing to change: the new settings have defaults. Move your book-kit dependency and any @v0.6 workflow refs to 0.7.0 / @v0.7, and run build parity to confirm your output is unchanged.