chore: add project planning-with-files hooks

.codex/hooks/pre-tool-use.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+# planning-with-files: Pre-tool-use hook for Codex
+
+HOOK_DIR="$(cd "$(dirname "$0")" 2>/dev/null && pwd)"
+PLAN_DIR="$(sh "${HOOK_DIR}/resolve-plan-dir.sh" 2>/dev/null)"
+PLAN_FILE="${PLAN_DIR:+${PLAN_DIR}/}task_plan.md"
+
+if [ -f "$PLAN_FILE" ]; then
+    # Log plan context to stderr so the Codex adapter can surface it as systemMessage.
+    head -30 "$PLAN_FILE" >&2
+fi
+
+echo '{"decision": "allow"}'
+exit 0