Complete tasks 3-7: harden verdict parsing, outputs retention, base branch, linux schedule parity, claim loop task

tasks/complete/parametrize-base-branch/CODE_REVIEW.md

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+# Code Review: parametrize-base-branch
+
+## SPEC coverage
+
+| Req | Status |
+|-----|--------|
+| R1 — _gate_worktree_drift reads base_branch | ✓ `_base_branch(cfg)` in git diff argv |
+| R2 — Helper: None→main, empty→main+WARN, non-str→str+WARN, explicit→explicit | ✓ |
+| R3 — Bad-revision still WARNING-skip | ✓ unchanged |
+| R4 — Template includes base_branch | ✓ |
+| R5 — No new deps | ✓ |
+
+## Cross-script impact
+
+No impact on loop-runner.py. Only status.py and the template.
+
+## Verdict
+
+PASS.