feat: US-014 - Migrate production chat from Gemini to OpenRouter

Ralph/prd.json

@@ -273,11 +273,7 @@
         "Verify in browser: chat opens, sends a message, streams a response correctly"
       ],
       "priority": 14,
-<<<<<<< Updated upstream
       "passes": true,
-      "notes": "The current API base is 'https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash'. Change the model segment to 'gemini-3-flash-preview'. The API path structure (v1beta/models/{model}:streamGenerateContent) should be the same. Verify that gemini-3-flash-preview is the correct model ID — check Google AI Studio or the API docs. For the display name, use a human-friendly string like 'Gemini 3 Flash' (not the full model ID). The constant should be defined at the top of gemini.ts and exported for use in ChatWidget."
-=======
-      "passes": false,
       "notes": "OpenRouter uses the OpenAI-compatible format. Key differences from Gemini: (1) Auth via Bearer token header, not URL param. (2) System prompt is a message with role:'system', not a separate system_instruction field. (3) Streaming SSE data lines contain {choices:[{delta:{content:'...'}}]}, not candidates[0].content.parts[0].text. (4) The [DONE] sentinel is the same. (5) Add headers: 'HTTP-Referer': window.location.origin, 'X-Title': 'Andy Charlwood Portfolio'. The buildSystemPrompt() function and its content stay the same — only the API transport changes. The buildRequestBody() function needs the most changes."
     },
     {
@@ -375,7 +371,6 @@
       "priority": 19,
       "passes": false,
       "notes": "This is the iterative loop. In a single Ralph iteration, run the benchmark, review results, and if needed make targeted improvements to the system prompt in llm.ts. Focus on structural fixes: if Q7 (clinical specialties) fails, ensure the system prompt lists specialties under the relevant role — this helps ALL specialty questions, not just Q7. If the benchmark takes too many iterations, focus on getting the most impactful improvements in and document remaining gaps. The anti-benchmaxing rules apply: no hardcoded answers, no question-specific prompt clauses."
->>>>>>> Stashed changes
     }
   ]
 }

Ralph/progress.txt

@@ -18,12 +18,14 @@
 - `loadEmbeddings()` and `paletteMap` (Map<id, PaletteItem>) are precomputed via `useMemo` — no re-computation on each search
 - ChatWidget is mounted in DashboardLayout alongside CommandPalette and DetailPanel — z-index 90 (below command palette z-1000)
 - `prefersReducedMotion` pattern: read `window.matchMedia` at module level, use in framer-motion variants to skip animation
-- ChatWidget stores messages as `Array<{ role: 'user' | 'assistant', content: string }>` — same shape as LLM message format, ready for Gemini integration
+- ChatWidget stores messages as `Array<{ role: 'user' | 'assistant', content: string }>` — same shape as LLM message format
 - ChatWidget `isOpen` state controls both panel visibility and button icon (MessageCircle ↔ X) — panel rendering handled by AnimatePresence
-- `src/lib/gemini.ts` exports `sendChatMessage(messages)` (async generator), `isGeminiAvailable()`, `parseItemIds(text)`, `stripItemsSuffix(text)` — ChatMessage type is `{ role: 'user' | 'assistant', content: string }`
-- Gemini API uses SSE streaming: POST to `:streamGenerateContent?alt=sse&key=KEY`, parse `data:` lines as JSON, extract `candidates[0].content.parts[0].text`
-- System prompt built from `buildEmbeddingTexts()` — instructs model to end responses with `[ITEMS: id1, id2, id3]` for portfolio item linking
-- `isGeminiAvailable()` checks `import.meta.env.VITE_GEMINI_API_KEY` — when missing, chat panel shows "unavailable" message but button remains visible
+- `src/lib/llm.ts` exports `sendChatMessage(messages)` (async generator), `isLLMAvailable()`, `buildSystemPrompt()`, `parseItemIds(text)`, `stripItemsSuffix(text)`, `LLM_MODEL`, `LLM_DISPLAY_NAME` — ChatMessage type is `{ role: 'user' | 'assistant', content: string }`
+- LLM API uses OpenRouter (OpenAI-compatible): POST to `https://openrouter.ai/api/v1/chat/completions` with `stream: true`, auth via `Authorization: Bearer` header, parse SSE `data:` lines as JSON, extract `choices[0].delta.content`
+- System prompt sent as `role: 'system'` message (first in messages array), built from `buildEmbeddingTexts()` — instructs model to end responses with `[ITEMS: id1, id2, id3]` for portfolio item linking
+- `isLLMAvailable()` checks `import.meta.env.VITE_OPEN_ROUTER_API_KEY` — when missing, chat panel shows "unavailable" message but button remains visible
+- OpenRouter requires `HTTP-Referer` and `X-Title` headers — set to `window.location.origin` and `'Andy Charlwood Portfolio'` respectively
+- Model is `z-ai/glm-5` (set in `LLM_MODEL` constant in `llm.ts`)
 - Assistant messages store item IDs as `<!--ITEMS:id1,id2-->` HTML comment suffix for US-010 to parse — `getDisplayText()` strips this before rendering
 - Conversation history capped at 10 messages (`MAX_HISTORY`), metadata stripped before sending to API
 - Icon/color mappings (`iconByType`, `iconColorStyles`) live in `src/lib/palette-icons.ts` — shared between CommandPalette and ChatWidget
@@ -312,3 +314,33 @@
   - Concrete examples in format instructions (e.g., `[ITEMS: exp-nhs-nwicb, skill-python]`) are more reliable than generic placeholders (`[ITEMS: id1, id2]`)
   - The `GEMINI_MODEL` and `GEMINI_DISPLAY_NAME` constants in `gemini.ts` are already exported and used by `ChatWidget.tsx` — single source of truth for model identity
 ---
+
+## 2026-02-16 - US-014
+- Renamed `src/lib/gemini.ts` → `src/lib/llm.ts` via `git mv`
+- Rewrote `llm.ts` for OpenRouter API (OpenAI-compatible format):
+  - API endpoint: `https://openrouter.ai/api/v1/chat/completions`
+  - Model: `z-ai/glm-5` (exported as `LLM_MODEL`)
+  - Display name: `GLM-5` (exported as `LLM_DISPLAY_NAME`)
+  - Auth: `Authorization: Bearer` header using `VITE_OPEN_ROUTER_API_KEY` env var
+  - Added `HTTP-Referer` and `X-Title` headers per OpenRouter docs
+  - System prompt sent as `role: 'system'` message (first in messages array) instead of Gemini's `system_instruction` field
+  - SSE streaming parses `choices[0].delta.content` instead of Gemini's `candidates[0].content.parts[0].text`
+  - No `'model'` role mapping needed — OpenRouter uses `'assistant'` directly
+  - Request body uses `max_tokens` (OpenAI format) instead of `maxOutputTokens` (Gemini format)
+- Renamed `isGeminiAvailable()` → `isLLMAvailable()`, updated all call sites in `ChatWidget.tsx`
+- Updated all imports: `ChatWidget.tsx` now imports from `@/lib/llm` instead of `@/lib/gemini`
+- Renamed `GEMINI_DISPLAY_NAME` → `LLM_DISPLAY_NAME` and updated ChatWidget header display
+- `buildSystemPrompt()` now exported (was private) for use by benchmark script in US-015
+- Fixed merge conflict in `Ralph/prd.json` (resolved to keep OpenRouter migration stories US-014–US-019)
+- `parseItemIds()` and `stripItemsSuffix()` unchanged — response format spec is the same
+- Typecheck (0 errors), lint (0 new errors), production build all pass
+- Files changed: `src/lib/gemini.ts` → `src/lib/llm.ts` (renamed + rewritten), `src/components/ChatWidget.tsx`, `Ralph/prd.json`
+- **Learnings for future iterations:**
+  - OpenRouter uses OpenAI-compatible format: `messages` array with `role: 'system'|'user'|'assistant'`, `choices[0].delta.content` for streaming
+  - Gemini's `system_instruction` field → OpenRouter's first message with `role: 'system'`
+  - Gemini's `'model'` role → OpenRouter's `'assistant'` role (no mapping needed since ChatMessage already uses 'assistant')
+  - OpenRouter requires `HTTP-Referer` and `X-Title` headers — use `window.location.origin` for referer
+  - `VITE_OPEN_ROUTER_API_KEY` replaces `VITE_GEMINI_API_KEY` — update `.env` file accordingly
+  - `buildSystemPrompt()` is now exported from `llm.ts` — benchmark script (US-015) can import it directly instead of duplicating the logic
+  - The benchmark script (`scripts/benchmark.ts`) still uses the old Gemini API — needs separate migration in US-015
+---

src/components/ChatWidget.tsx

@@ -3,12 +3,12 @@ import { motion, AnimatePresence } from 'framer-motion'
 import { MessageCircle, X, Send, Loader2 } from 'lucide-react'
 import {
   sendChatMessage,
-  isGeminiAvailable,
+  isLLMAvailable,
   parseItemIds,
   stripItemsSuffix,
-  GEMINI_DISPLAY_NAME,
+  LLM_DISPLAY_NAME,
   type ChatMessage,
-} from '@/lib/gemini'
+} from '@/lib/llm'
 import { buildPaletteData } from '@/lib/search'
 import type { PaletteItem, PaletteAction } from '@/lib/search'
 import { iconByType, iconColorStyles } from '@/lib/palette-icons'
@@ -64,7 +64,7 @@ export function ChatWidget({ onAction }: ChatWidgetProps) {
   const messagesEndRef = useRef<HTMLDivElement>(null)
   const inputRef = useRef<HTMLTextAreaElement>(null)
 
-  const geminiAvailable = isGeminiAvailable()
+  const llmAvailable = isLLMAvailable()
 
   // Build palette map for looking up items by ID
   const paletteMap = useMemo(() => {
@@ -264,7 +264,7 @@ export function ChatWidget({ onAction }: ChatWidgetProps) {
                       color: 'var(--text-tertiary)',
                     }}
                   >
-                    {GEMINI_DISPLAY_NAME}
+                    {LLM_DISPLAY_NAME}
                   </span>
                 </div>
                 <button
@@ -306,7 +306,7 @@ export function ChatWidget({ onAction }: ChatWidgetProps) {
                 }}
                 className="pmr-scrollbar"
               >
-                {!geminiAvailable && (
+                {!llmAvailable && (
                   <div
                     style={{
                       textAlign: 'center',
@@ -320,7 +320,7 @@ export function ChatWidget({ onAction }: ChatWidgetProps) {
                   </div>
                 )}
 
-                {geminiAvailable && messages.length === 0 && (
+                {llmAvailable && messages.length === 0 && (
                   <div style={{ display: 'flex', flexDirection: 'column', gap: '12px' }}>
                     {/* Welcome bubble — styled as assistant message */}
                     <div style={{ display: 'flex', justifyContent: 'flex-start' }}>
@@ -537,7 +537,7 @@ export function ChatWidget({ onAction }: ChatWidgetProps) {
               </div>
 
               {/* Input area */}
-              {geminiAvailable && (
+              {llmAvailable && (
                 <div
                   style={{
                     padding: '12px 16px',

src/lib/llm.ts

@@ -5,20 +5,20 @@ export interface ChatMessage {
   content: string
 }
 
-export const GEMINI_MODEL = 'gemini-3-flash-preview'
-export const GEMINI_DISPLAY_NAME = 'Gemini 3 Flash'
+export const LLM_MODEL = 'z-ai/glm-5'
+export const LLM_DISPLAY_NAME = 'GLM-5'
 
-const GEMINI_API_BASE = `https://generativelanguage.googleapis.com/v1beta/models/${GEMINI_MODEL}`
+const OPENROUTER_API_URL = 'https://openrouter.ai/api/v1/chat/completions'
 
 function getApiKey(): string | undefined {
-  return import.meta.env.VITE_GEMINI_API_KEY as string | undefined
+  return import.meta.env.VITE_OPEN_ROUTER_API_KEY as string | undefined
 }
 
-export function isGeminiAvailable(): boolean {
+export function isLLMAvailable(): boolean {
   return !!getApiKey()
 }
 
-function buildSystemPrompt(): string {
+export function buildSystemPrompt(): string {
   const texts = buildEmbeddingTexts()
   const cvContent = texts.map((t) => `[${t.id}] ${t.text}`).join('\n')
 
@@ -45,20 +45,18 @@ function buildRequestBody(
   messages: ChatMessage[],
   systemPrompt: string,
 ): object {
-  const contents = messages.map((msg) => ({
-    role: msg.role === 'assistant' ? 'model' : 'user',
-    parts: [{ text: msg.content }],
-  }))
-
   return {
-    system_instruction: {
-      parts: [{ text: systemPrompt }],
-    },
-    contents,
-    generationConfig: {
-      temperature: 0.7,
-      maxOutputTokens: 512,
-    },
+    model: LLM_MODEL,
+    stream: true,
+    temperature: 0.7,
+    max_tokens: 512,
+    messages: [
+      { role: 'system', content: systemPrompt },
+      ...messages.map((msg) => ({
+        role: msg.role,
+        content: msg.content,
+      })),
+    ],
   }
 }
 
@@ -67,23 +65,25 @@ export async function* sendChatMessage(
 ): AsyncGenerator<string> {
   const apiKey = getApiKey()
   if (!apiKey) {
-    throw new Error('Gemini API key not configured')
+    throw new Error('LLM API key not configured')
   }
 
   const systemPrompt = buildSystemPrompt()
   const body = buildRequestBody(messages, systemPrompt)
 
-  const response = await fetch(
-    `${GEMINI_API_BASE}:streamGenerateContent?alt=sse&key=${apiKey}`,
-    {
-      method: 'POST',
-      headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify(body),
+  const response = await fetch(OPENROUTER_API_URL, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+      'Authorization': `Bearer ${apiKey}`,
+      'HTTP-Referer': window.location.origin,
+      'X-Title': 'Andy Charlwood Portfolio',
     },
-  )
+    body: JSON.stringify(body),
+  })
 
   if (!response.ok) {
-    throw new Error(`Gemini API error: ${response.status}`)
+    throw new Error(`LLM API error: ${response.status}`)
   }
 
   const reader = response.body?.getReader()
@@ -102,7 +102,6 @@ export async function* sendChatMessage(
       buffer += decoder.decode(value, { stream: true })
 
       const lines = buffer.split('\n')
-      // Keep the last potentially incomplete line in the buffer
       buffer = lines.pop() ?? ''
 
       for (const line of lines) {
@@ -114,7 +113,7 @@ export async function* sendChatMessage(
 
         try {
           const parsed = JSON.parse(jsonStr)
-          const text = parsed?.candidates?.[0]?.content?.parts?.[0]?.text
+          const text = parsed?.choices?.[0]?.delta?.content
           if (text) {
             yield text
           }
@@ -130,7 +129,7 @@ export async function* sendChatMessage(
       if (jsonStr && jsonStr !== '[DONE]') {
         try {
           const parsed = JSON.parse(jsonStr)
-          const text = parsed?.candidates?.[0]?.content?.parts?.[0]?.text
+          const text = parsed?.choices?.[0]?.delta?.content
           if (text) {
             yield text
           }