test(review-loop-run): CR-7/8/9 handles + fixtures, gated behind CR789_IMPL_READY (bug 5352fe72)

Default run: 40 passed + SKIP. CR789_IMPL_READY=1: 10 red until implementation.

Claude-Session: https://claude.ai/code/session_01G3SkMRBRWXyiGuMGs8WVas

tests/fixtures/review-loop-run/annotated-table-cell.md

@@ -0,0 +1,10 @@
+# Review
+
+## Count by severity
+
+| Severity | Count |
+|----------|-------|
+| CRITICAL | 0 |
+| HIGH | 1 (H-R3-1: gate bypass) |
+| MEDIUM | 2 (M-1, M-2) |
+| LOW | 0 |

tests/fixtures/review-loop-run/declaration-with-annotation.md

@@ -0,0 +1,5 @@
+# Review
+
+## Count by severity
+
+- HIGH: 1 (H-R3-1)

tests/fixtures/review-loop-run/prose-historic-quote.md

@@ -0,0 +1,12 @@
+# Review
+
+## Count by severity
+
+| Severity | Count |
+|----------|-------|
+| CRITICAL | 0 |
+| HIGH | 2 |
+| MEDIUM | 0 |
+| LOW | 0 |
+
+Note: the earlier bug reported MEDIUM=404 seen on 2026-09-13.

tests/fixtures/review-loop-run/suspect-derived-lower.md

@@ -0,0 +1,9 @@
+# Review
+
+## critical
+
+There is a serious problem described here, but this section does not
+follow the declaration-line or table conventions the parser expects,
+so no severity value can be extracted from it.
+
+Further prose continues without any line starting with a severity word.

tests/fixtures/review-loop-run/suspect-derived.md

@@ -0,0 +1,9 @@
+# Review
+
+## CRITICAL
+
+There is a serious problem described here, but this section does not
+follow the declaration-line or table conventions the parser expects,
+so no severity value can be extracted from it.
+
+Further prose continues without any line starting with a severity word.