Adds `git.base_branch` config option that controls the target branch
for PRs and merges. When unset, auto-detects from origin/HEAD and
falls back to "main".
This fixes projects using `master`, `develop`, or any other default
branch — previously `/gsd:ship` would create PRs targeting `main`
(which may not exist) and `/gsd:complete-milestone` would try to
checkout `main` and fail.
Changes:
- config.cjs: add git.base_branch to valid config keys
- planning-config.md: document the option with auto-detect behavior
- ship.md: detect base branch at init, use in PR create, branch
detection, push report, and completion report
- complete-milestone.md: detect base branch, use for squash merge
and merge-with-history checkout targets
- 1 new test for config-set git.base_branch
Usage:
gsd-tools config-set git.base_branch master
Or auto-detect (default — reads origin/HEAD):
git.base_branch: null
Closes#1466
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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