drift-check

# Drift Check Pre-PR deviation check against the project spec. Run this before `/create-pr` to verify alignment between implementation and documentation. > **Reference:** See `~/.claude/docs/prd-workflow/spec-driven-development.md` §2–§4 for the deviation threshold, workflow, and checkpoint cadence that this skill operationalizes. **Not the same as** `/code-review` — that inspects the diff for correctness bugs and cleanups; this checks the diff against the _spec and docs_ for deviations. They run at the same pre-PR moment and complement each other. ## Your task Perform a lightweight, advisory review of the current branch's changes against the project's spec and living documents. This is a read-only check — do not modify any files. ### Step 1: Identify scope - **Determine the default branch first — don't assume `main`.** Run `git rev-parse --abbrev-ref origin/HEAD`; it prints e.g. `origin/main` or `origin/master`, and the part after `origin/` is the base branch for the commands below. If it errors (no `origin/HEAD` set locally), fall back to `git remote show origin` (read its "HEAD branch:" line) or default to `main`. Use this detected base wherever `<base>` appears below. (Run the detection as a plain command and substitute the result literally — don't wrap it in `$(...)`, which triggers a permission prompt.) - Run `git log <base>..HEAD --oneline` to see all commits on this branch - Run `git diff <base>...HEAD --stat` to see all files changed - Determine which feature ...