When project_code is set (e.g., "CK"), phase directories are prefixed
with the code: CK-01-foundation, CK-02-api, etc. This disambiguates
phases across multiple GSD projects in the same session.
Changes:
- Add project_code to VALID_CONFIG_KEYS and buildNewProjectConfig defaults
- Add project_code to loadConfig in core.cjs
- Prepend prefix in cmdPhaseAdd and cmdPhaseInsert
- Update searchPhaseInDir, cmdFindPhase, comparePhaseNum, and
normalizePhaseName to strip prefix before matching/sorting
- Support {project} placeholder in git.phase_branch_template
- Add 4 tests covering prefixed add, null code, find, and sort
Closes#1019
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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