fix(cli): surface git output when initial commit fails

[fengmk2]

Problem

When the initial commit fails during vp create --git, the warning always says "Check your git user.name/user.email config" even when the failure has nothing to do with git identity (e.g. a failing pre-commit hook). The actual git error is discarded, making the failure hard to diagnose.

Fix

createInitialCommit now returns the combined stdout/stderr of git commit, and both call sites print it under the Initial commit failed warning. When identity is the real problem, git's own message is shown verbatim.

Adds a snap test (create-git-commit-fail) that scaffolds the builtin vite:monorepo template offline and forces a deterministic pre-commit hook failure via GIT_CONFIG_* env vars, locking in the surfaced output.

---

Note

Low Risk
CLI-only UX and return-type change for initial commit; no auth or data-path changes, covered by a snap test.

Overview
When vp create --git cannot create the initial commit, the CLI no longer assumes a user.name/user.email problem. createInitialCommit now returns success plus combined git commit stdout/stderr, and both create flows print that text under a short Initial commit failed warning.

A new snap test (create-git-commit-fail) forces a failing pre-commit hook via core.hooksPath and asserts the hook message appears while .git is still created.

^{Reviewed by Cursor Bugbot for commit b83cfd2. Configure here.}

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[fengmk2]

@cursor review

[cursor]

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^{Reviewed by Cursor Bugbot for commit b83cfd2. Configure here.}