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

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

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+# Doc Review: parametrize-base-branch
+
+## Docs touched
+
+- `CHANGELOG.md` — new `[unreleased]` entry "Fixed — parametrize-base-branch".
+- `design/loops/functional.md` §9 — updated `blast_radius` field list to include `base_branch`.
+- `templates/loops/self-improvement/loop.json` — already updated (schema edit).
+
+## Docs NOT touched
+
+- `design/loops/technical.md`: drift gate internal change not documented at the architecture level. No edit.
+- `AGENTS.md`, `README.md`: no user-facing integration impact. No edits.
+
+## Verdict
+
+Docs in sync. Proceed to referee.