chore: release 0.12.9, begin 0.12.10.dev0 development (#3426)

* chore: bump version to 0.12.9

* chore: begin 0.12.10.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 -->
 
+## [0.12.9] - 2026-07-09
+
+### Changed
+
+- fix(integrations): skip Windows Store python3 alias stub in resolve_python_interpreter (#3385)
+- fix(integrations): escape control characters in SKILL.md frontmatter (#3399)
+- fix(workflows): apply chained expression filters left-to-right (#3339)
+- fix(scripts): resolve invoke_separator by parse success, not python3 availability (#3304) (#3320)
+- fix(shared-infra): refresh_shared_templates preserves recovered user files (#3378)
+- fix(agents): resolve skill placeholders in Goose (yaml) command output (#3374)
+- fix(bundler): enforce version pin on bundled preset/extension installs (#3377)
+- Update Golden Demo extension to v0.3.0 (#3394)
+- test: isolate integration test home (#3144)
+- chore: release 0.12.8, begin 0.12.9.dev0 development (#3410)
+
 ## [0.12.8] - 2026-07-08
 
 ### Changed

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "specify-cli"
-version = "0.12.9.dev0"
+version = "0.12.10.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"