* fix(#2831): expand HOME in OpenCode skill/template paths
OpenCode does not shell-expand $HOME in @file references on any platform —
the literal `@$HOME/...` path is resolved relative to the config command/
dir, producing `command/$HOME/...` (file not found). The previous fix for
#2376 only guarded Windows; extend to all platforms.
Closes#2831
* test(#2831): assert behavior via exported computePathPrefix, not source grep
Addresses CodeRabbit review on PR #2842:
- Extracts pathPrefix logic into a named, test-exported computePathPrefix
helper in bin/install.js (no behavior change at the call site).
- Rewrites bug-2376 and bug-2831 regression tests to call the exported
function directly instead of regex-matching install.js source text,
per the repo's no-source-grep testing standard.
- Wraps temp-dir test setup in try/finally so cleanup runs on assertion
failures (no leaked tmp dirs).
#2388 (plan-phase silently renames feature branch): add explicit Git
Branch Invariant section to plan-phase.md prohibiting branch
creation/rename/switch during planning; phase slug changes are
plan-level only and must not affect the git branch.
#2431 (worktree teardown silently swallows errors): replace
`git worktree remove --force 2>/dev/null || true` with a lock-aware
block in quick.md and execute-phase.md that detects locked worktrees,
attempts unlock+retry, and surfaces a user-visible recovery message
when removal still fails.
#2396 (hardcoded test commands bypass Makefile): add a three-tier
test command resolver (project config → Makefile/Justfile → language
sniff) in execute-phase.md, verify-phase.md, and audit-fix.md.
Makefile with a `test:` target now takes priority over npm/cargo/go.
#2376 (OpenCode @$HOME not mapped on Windows): add platform guard in
bin/install.js so OpenCode on win32 uses the absolute path instead of
`$HOME/...`, which OpenCode does not expand in @file references on
Windows.
Tests: 29 new assertions across 4 regression test files (all passing).
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
