chore: prepare methodology 7.0.0 with numeric migration checks (#626)

Signed-off-by: strategist <strategist@korobeinikov.consulting>
Co-authored-by: strategist <strategist@korobeinikov.consulting>

chore: prepare methodology 6.0.0 release (#604)

Signed-off-by: transitrix <automation@transitrix.com>
Co-authored-by: transitrix <automation@transitrix.com>

Release v5.1.0 — documents package, knowledge supersession, paged media

Release v5.0.0 — ReqIF lifecycle retirement (breaking)

Release v4.2.0 — STANDARD TYPE

Release v4.1.0 — assembled_on validator tests

A MINOR release including validator tests and fixtures for the
assembled_on relation kind. All changes are additive:
- Validator tests for assembled_on (PR #532)
- Adopter guide (from PR #531)
- assembled_on vocabulary entry (from PR #531)

No migration recipe required (additive only).