Add development tooling documentation

- AGENTS.md: Documentation for AI agents and development workflows
- opencode.json: OpenCode configuration file for testing alternative AI tools

opencode.json

@@ -0,0 +1,49 @@
+{
+  "$schema": "https://opencode.ai/config.json",
+  "permission": {
+    "bash": {
+      "git branch -d": "ask",
+      "git branch -D": "ask",
+      "git status": "allow",
+      "git diff": "allow",
+      "git log": "allow",
+      "git show": "allow",
+      "git branch": "allow",
+      "git remote": "allow",
+      "git fetch": "allow",
+      "git pull": "allow",
+      "git merge": "ask",
+      "git rebase": "ask",
+      "git commit": "ask",
+      "git push": "ask",
+      "git checkout": "ask",
+      "git switch": "ask",
+      "git reset": "ask",
+      "git revert": "ask",
+      "git rm": "ask",
+      "git mv": "ask",
+      "git worktree": "ask",
+      "cat": "allow",
+      "tail": "allow",
+      "head": "allow",
+      "less": "allow",
+      "more": "allow",
+      "grep": "allow",
+      "find": "allow",
+      "ls": "allow",
+      "pwd": "allow",
+      "cd": "allow",
+      "mkdir": "ask",
+      "rm": "ask",
+      "rmdir": "ask",
+      "mv": "ask",
+      "cp": "ask",
+      "touch": "ask",
+      "chmod": "ask",
+      "chown": "ask",
+      "su": "deny",
+      "sudo": "deny",
+      "*": "ask"
+    }
+  }
+}