Template
TEMPLATE.md Versioning section; notes in README, CHANGELOG and the firmware/software READMEs. Source: contrib/product-template in B4L/proplan.
Software
Host tools and apps (diagnostics, configuration, test rigs), one folder per
tool, for example software/diag/ with its own README and pyproject.toml or
Cargo.toml.
Versions: CalVer per tool, tagged software/<tool>/YYYY.MM.MICRO (for
example software/diag/2026.10.0: month without a leading zero, MICRO
counting that month's releases from 0). Each tool folder has its own
CHANGELOG.md, and its README says which firmware MAJOR versions it talks to.