governance: keep repository root clean; remove marker file; implement repo detection via structure heuristic; update tests and system prompts/templates

tests/00_cli_guardrails.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -euo pipefail
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+. "$ROOT_DIR/tests/helpers/assert.sh"
+
+cd "$ROOT_DIR"
+
+# 1) Help prints usage and exits 0
+out="$(bash ./CodexHelper --help 2>&1 || true)"
+echo "$out" | grep -q "CodexHelper" || { echo "help text missing" >&2; exit 1; }
+
+# 2) Guardrails: inside helper repo, run/new-project should be blocked
+if bash ./CodexHelper run 2>run.err 1>run.out; then
+  echo "run should fail in helper repo" >&2; exit 1
+fi
+grep -q "Only 'new-mode'" run.err || { echo "missing guardrail message for run" >&2; exit 1; }
+
+if bash ./CodexHelper new-project --mode Demo --name demo --path /tmp 2>np.err 1>np.out; then
+  echo "new-project should fail in helper repo" >&2; exit 1
+fi
+grep -q "Only 'new-mode'" np.err || { echo "missing guardrail message for new-project" >&2; exit 1; }
+
+exit 0