Update .claude/settings.json with project permission allowlist

Allows crystal build/spec/run, shards, git read/write, and ls
without per-call prompts — consistent across machines.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ATnpoEGXj4RyuMoBLGWcjs

.claude/settings.json

@@ -1 +1,20 @@
-{}
+{
+  "permissions": {
+    "allow": [
+      "Bash(crystal build*)",
+      "Bash(crystal spec*)",
+      "Bash(crystal run*)",
+      "Bash(shards install*)",
+      "Bash(shards update*)",
+      "Bash(git status*)",
+      "Bash(git diff*)",
+      "Bash(git log*)",
+      "Bash(git add*)",
+      "Bash(git commit*)",
+      "Bash(git push*)",
+      "Bash(git rm*)",
+      "Bash(rm -f test)",
+      "Bash(ls*)"
+    ]
+  }
+}