refactor(test): migrate rewind --list consumers to checkpoint list --pending --json
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Commit

Repoint every reader of the removed rewind --list listing at
checkpoint list --pending --json. The parsed JSON shape is identical, so
downstream call sites are untouched:
- integration_test/testenv.go TestEnv.GetRewindPoints() (drives ~48 call sites)
- integration_test/setup_cmd_test.go TestRewindBlockedWhenDisabled invocation
- testutil/testutil.go RewindPoint doc comment
- e2e/entire/entire.go RewindList() harness helper + RewindPoint doc
- WINDOWS.md, .claude/skills/test-repo/SKILL.md docs
The rewind action helpers (env.Rewind / entire.Rewind / RewindLogsOnly) are
unchanged — they exercise checkpoint rewind --to, which still exists.