fix: resolve CI build errors

- Fix Astro template parsing for mermaid diagrams with {{}} syntax
- Add test environment detection to avoid OPENROUTER_API_KEY requirement in CI

Author: cameronrye

docs/.astro/types.d.ts

@@ -1 +1,2 @@
 /// <reference types="astro/client" />
+/// <reference path="content.d.ts" />

docs/src/pages/docs/architecture.astro

@@ -131,7 +131,7 @@ flowchart TB
   </p>
 
   <div class="diagram">
-    <pre class="mermaid">
+    <pre class="mermaid" set:html={`
 flowchart LR
     A["User Message"] --> B["Add to History"]
     B --> C["Truncate Context"]
@@ -141,7 +141,7 @@ flowchart LR
     F --> G["Add Results"]
     G --> D
     E -->|"Final Answer"| H["Return Response"]
-    </pre>
+    `}></pre>
   </div>
 
   <p>Key aspects of the loop:</p>
@@ -201,7 +201,7 @@ sequenceDiagram
   </p>
 
   <div class="diagram">
-    <pre class="mermaid">
+    <pre class="mermaid" set:html={`
 flowchart TD
     A["Tool Call Received"] --> B{{"Requires Confirmation?"}}
     B -->|No| E["Execute Tool"]
@@ -215,7 +215,7 @@ flowchart TD
     H --> I["Run Tool Function"]
     I --> J["Return Result"]
     G --> J
-    </pre>
+    `}></pre>
   </div>
 
   <h2>Context Window Management</h2>
@@ -225,7 +225,7 @@ flowchart TD
   </p>
 
   <div class="diagram">
-    <pre class="mermaid">
+    <pre class="mermaid" set:html={`
 flowchart TD
     A["Estimate Conversation Tokens"] --> B{{"Exceeds Limit?"}}
     B -->|No| C["Return Messages As-Is"]
@@ -238,7 +238,7 @@ flowchart TD
         H["User Message"]
         I["Assistant + Tool Results"]
     end
-    </pre>
+    `}></pre>
   </div>
 
   <p>

src/config/index.ts

@@ -20,10 +20,27 @@ const envSchema = z.object({
 
 export type EnvConfig = z.infer<typeof envSchema>;
 
+/**
+ * Check if we're running in a test environment
+ */
+const isTestEnv = process.env.NODE_ENV === "test" || typeof Bun !== "undefined" && Bun.env.BUN_ENV === "test" || process.argv.some(arg => arg.includes("bun") && arg.includes("test"));
+
 /**
  * Validate and parse environment variables
  */
 function loadConfig(): EnvConfig {
+  // In test environment, use defaults if API key not provided
+  if (isTestEnv && !process.env.OPENROUTER_API_KEY) {
+    return {
+      OPENROUTER_API_KEY: "test-api-key",
+      OPENROUTER_MODEL: "anthropic/claude-sonnet-4",
+      APP_NAME: "Clarissa",
+      APP_URL: undefined,
+      MAX_ITERATIONS: 10,
+      DEBUG: false,
+    };
+  }
+
   const result = envSchema.safeParse(process.env);
 
   if (!result.success) {