feat: Git extension stage 2 — GIT_BRANCH_NAME override, --force for existing dirs, auto-install tests (#1940)#2117

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mnriem wants to merge 13 commits intogithub:mainfrom

mnriem:git-extension-stage2

Commits on Apr 7, 2026

feat: Git extension stage 2 — GIT_BRANCH_NAME override, --force for existing dirs, auto-install tests (#1940)
mnriem
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fix: remove unused Tuple import (ruff F401)
mnriem
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fix: address Copilot review feedback (#2117)
mnriem
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fix: address second round of Copilot review feedback (#2117)
mnriem
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fix: use UTF-8 byte count for 244-byte branch name limit (#2117)
mnriem
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fix: address third round of review feedback (#2117)
mnriem
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fix: normalize relative paths and fix Test-HasGit compat (#2117)
mnriem
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test: add GIT_BRANCH_NAME automated tests for bash and PowerShell (#2117)
mnriem
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fix: restore git init during specify init + review fixes (#2117)
mnriem
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fix: use init_git_repo error_msg in failure output (#2117)
mnriem
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fix: ensure_executable_scripts also covers .specify/extensions/ (#2117)
mnriem
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fix: move chmod after extension install + sanitize error_msg (#2117)
mnriem
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fix: use tracker.error for git init/extension failures (#2117)
mnriem
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