docs-foldlisted

# Docs fold ## Guards - If no `.claude/` directory exists, stop: `❌ No .claude/ directory found. Run canon claude init to set up the workflow.` The skip for a session that changed nothing lives at the end of Step 2, because it needs the diff to decide. It drops the doc rewrite alone. The diff-driven sweeps in Steps 4 and 5 still run. ## Diff baseline Steps 2, 4, 5, and 7 share one diff on the usable path. An unusable baseline splits them, per the rule below. Resolve the base ref once and reuse it: ```bash git merge-base HEAD origin/main 2>/dev/null || git merge-base HEAD main 2>/dev/null ``` Take the union of `git diff --name-only <base> HEAD`, `git diff --name-only HEAD`, and `git ls-files --others --exclude-standard`. Read content with `git diff <base> HEAD` and `git diff HEAD`. Prefer `origin/main` over local `main`. On `main` itself the local ref resolves to HEAD, so every committed change drops out of the set and the skill goes blind to the work it is meant to read. The baseline is unusable in two cases: - No merge base resolves against either ref. - The base came from local `main` and equals HEAD. Nothing is pushed to compare against, so a narrow read reports no changes rather than admitting it cannot see them. An unusable baseline costs only the committed half. `git diff <base> HEAD` is empty by definition once the base equals HEAD, while `git diff HEAD` and `git ls-files --others --exclude-standard` still report uncommitted and untracked work at correct sco