dsh-pre-push-checks

# DSH Pre-Push Checks Use this skill to run relevant local evidence once before a `deepseek-harness` push. The sole ordering exception is `gh stack sync`, which may publish a cascading rebase before the rewritten layers can be validated; validate them immediately afterward and do not merge until the evidence passes. Git hooks are intentionally narrow: pre-commit fixes staged lint, checks staged whitespace, and guards vendored-source metadata; pre-push runs only the incremental repository typecheck. CI owns exhaustive coverage and the platform matrix. ## Inspect the outgoing change 1. Confirm the checkout and branch. ```sh git status --short --branch git rev-parse --show-toplevel ``` 2. Verify the live PR base or stack parent, fetch that ref, and inspect the complete scope against it. ```sh pnpm --silent run change-scope --base <verified-base-ref> ``` The command never guesses or fetches a base. Supply the ref verified from current remote or stack state; use `--head <ref>` when inspecting a commit other than `HEAD`. Its versioned JSON records committed paths relative to the resolved merge base, while staged, unstaged, and untracked paths describe the current worktree. After merging a changed base, rerun the report, reassess which behavior the combined scope can affect, and rerun only checks invalidated by the merge. ## Select relevant evidence There is no universal local baseline beyond the hooks. Every behavior change needs the narrowest available test or purpose-bui...