feat: add graphify plugin and documentation

- Introduced a new graphify OpenCode plugin to remind users about the knowledge graph before executing bash commands.
- Added AGENTS.md for agent guidance, including development commands, environment setup, Docker deployment, code structure, conventions, and testing instructions.
- Created opencode.json to configure the graphify plugin and superpowers.
- Updated tests to improve type safety and added missing imports in test files.
- Added .graphify_uncached.txt to track relevant files for graphify.

.opencode/plugins/graphify.js

@@ -0,0 +1,22 @@
+// graphify OpenCode plugin
+// Injects a knowledge graph reminder before bash tool calls when the graph exists.
+import { existsSync } from "fs";
+import { join } from "path";
+
+export const GraphifyPlugin = async ({ directory }) => {
+  let reminded = false;
+
+  return {
+    "tool.execute.before": async (input, output) => {
+      if (reminded) return;
+      if (!existsSync(join(directory, "graphify-out", "graph.json"))) return;
+
+      if (input.tool === "bash") {
+        output.args.command =
+          'echo "[graphify] Knowledge graph available. Read graphify-out/GRAPH_REPORT.md for god nodes and architecture context before searching files." && ' +
+          output.args.command;
+        reminded = true;
+      }
+    },
+  };
+};