Development version 1.5.3.dev0. Matches setup.cfg and src/wield/declarative/_version.py, both of which already say 1.5.3.dev0. The nearest tag in main's ancestry was devel-1.3.6.dev0, 65 commits back -- release-1.5.0 and release-1.5.1 exist but are not ancestors of main -- so a git-derived build called itself 1.3.6 despite the files saying 1.5.3. This is the tag that makes them agree. Covers the decl2 line: PhasedObserveImmutable, its documentation, and the additions made for the wield.model migration.