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.

tests/lib/buchungen.test.ts

@@ -1,5 +1,4 @@
 import { describe, it, expect } from "vitest";
-import { Decimal } from "@prisma/client";
 
 describe("Buchungen - Double-Entry Bookkeeping Logic", () => {
   describe("TransactionAccount Enum", () => {
@@ -32,7 +31,7 @@ describe("Buchungen - Double-Entry Bookkeeping Logic", () => {
     it("should calculate correct sign for EINLAGE (positive)", () => {
       // EINLAGE increases the company's assets
       const amount = 1000;
-      const type = "EINLAGE";
+      const type: "EINLAGE" | "ENTNAHME" = "EINLAGE";
       
       // In German bookkeeping: EINLAGE is recorded as positive (credit to equity)
       const signedAmount = type === "EINLAGE" ? amount : -amount;
@@ -42,7 +41,7 @@ describe("Buchungen - Double-Entry Bookkeeping Logic", () => {
     it("should calculate correct sign for ENTNAHME (negative)", () => {
       // ENTNAHME decreases the company's assets
       const amount = 500;
-      const type = "ENTNAHME";
+      const type: "EINLAGE" | "ENTNAHME" = "ENTNAHME";
       
       // In German bookkeeping: ENTNAHME is recorded as negative (debit to equity)
       const signedAmount = type === "EINLAGE" ? amount : -amount;

tests/lib/schemas.test.ts

@@ -1,3 +1,5 @@
+import { describe, it, expect } from "vitest";
+
 import {
   currencySchema,
   taxRateSchema,

tests/lib/tax.test.ts

@@ -1,3 +1,5 @@
+import { describe, it, expect } from "vitest";
+
 import {
   TAX_RATES,
   calcItemAmounts,