Multiple gt commands call git rev-parse --show-toplevel, adding ~50ms
each invocation. Results rarely change within a session, and multiple
agents calling git concurrently contend on .git/index.lock.
Add cached RepoRoot() and RepoRootFrom() functions to the git package
and update all callers to use them. This ensures a single git subprocess
call per process for the common case of checking the current directory's
repo root.
Files updated:
- internal/git/git.go: Add RepoRoot() and RepoRootFrom()
- internal/cmd/prime.go: Use cached git.RepoRoot()
- internal/cmd/molecule_status.go: Use cached git.RepoRoot()
- internal/cmd/sling_helpers.go: Use cached git.RepoRoot()
- internal/cmd/rig_quick_add.go: Use git.RepoRootFrom() for path arg
- internal/version/stale.go: Use cached git.RepoRoot()
Closes: bd-2zd.5
The quick-add command (used by shell hook's "Add to Gas Town?" prompt)
previously only checked hardcoded paths ~/gt and ~/gastown, ignoring
GT_TOWN_ROOT and any other Gas Town installations.
This caused rigs to be added to the wrong town when users had multiple
Gas Town installations (e.g., ~/gt and ~/Documents/code/gt).
Fix the town discovery order:
1. GT_TOWN_ROOT env var (explicit user preference)
2. workspace.FindFromCwd() (supports multiple installations)
3. Fall back to ~/gt and ~/gastown
