chore: release 0.12.13, begin 0.12.14.dev0 development (#3498)

* chore: bump version to 0.12.13

* chore: begin 0.12.14.dev0 development

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -2,6 +2,21 @@
 
 <!-- insert new changelog below this comment -->
 
+## [0.12.13] - 2026-07-13
+
+### Changed
+
+- fix(workflows): fail switch step on non-mapping cases instead of crashing (#3481)
+- Cleanup agent-file-template.md (#2579)
+- fix: mark Kiro integration as multi-install safe (#3472)
+- fix: rewrite extension-relative subdir paths in generated command bodies (#3444)
+- fix(templates): point constitution sync checklist at installed command files (#3418)
+- feat(workflows): make shell step timeout configurable (#3327) (#3328)
+- docs: clarify that release tags keep the leading v prefix (#3463)
+- fix(workflows): don't crash on membership test against a non-iterable (#3448)
+- fix(workflows): if-step validate accepts falsy non-list else (#3264)
+- chore: release 0.12.12, begin 0.12.13.dev0 development (#3490)
+
 ## [0.12.12] - 2026-07-13
 
 ### Changed

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "specify-cli"
-version = "0.12.13.dev0"
+version = "0.12.14.dev0"
 description = "Specify CLI, part of GitHub Spec Kit. A tool to bootstrap your projects for Spec-Driven Development (SDD)."
 readme = "README.md"
 requires-python = ">=3.11"