The global HOME override in runGsdTools broke tests in verify-health.test.cjs
on Ubuntu CI: git operations fail when HOME points to a tmpDir that lacks
the runner's .gitconfig.
- runGsdTools now accepts an optional third `env` parameter (default: {})
merged on top of process.env — no behavior change for callers that omit it
- Pass { HOME: tmpDir } only in the 6 tests that need ~/.gsd/ isolation:
brave_api_key detection, defaults.json merging (x2), and config-new-project
tests that assert concrete default values (x3)
a1207d5473