docs(19.3-05): record the miniredis checkpoint reply

.planning/phases/19.3-framework-transport-and-infrastructure-for-wavepath/19.3-05-SUMMARY.md

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+---
+phase: 19.3-framework-transport-and-infrastructure-for-wavepath
+plan: 05
+status: in-progress
+---
+
+# Phase 19.3 Plan 05: unit tests, phase gate and release decision (in progress)
+
+## Checkpoint replies
+
+### Task 4 (miniredis legitimacy check)
+
+Reply, verbatim, recorded before any go.mod change of Task 5:
+
+> approved
+
+Orchestrator instruction with it: install github.com/alicebob/miniredis/v2@v2.40.0 as test-only (only `_test.go` files in modules/cooler may import it).
+
+### Task 7 (release decision)
+
+Pending.
+
+<!-- The full SUMMARY replaces this file when the plan completes. -->