feat: activate buddy system in open build (#346)

src/buddy/CompanionSprite.tsx

@@ -1,5 +1,4 @@
 import { c as _c } from "react-compiler-runtime";
-import { feature } from 'bun:bundle';
 import figures from 'figures';
 import React, { useEffect, useRef, useState } from 'react';
 import { useTerminalSize } from '../hooks/useTerminalSize.js';
@@ -11,6 +10,7 @@ import { getGlobalConfig } from '../utils/config.js';
 import { isFullscreenActive } from '../utils/fullscreen.js';
 import type { Theme } from '../utils/theme.js';
 import { getCompanion } from './companion.js';
+import { isBuddyEnabled } from './feature.js';
 import { renderFace, renderSprite, spriteFrameCount } from './sprites.js';
 import { RARITY_COLORS } from './types.js';
 const TICK_MS = 500;
@@ -165,7 +165,7 @@ function spriteColWidth(nameWidth: number): number {
 // Narrow terminals: 0 — REPL.tsx stacks the one-liner on its own row
 // (above input in fullscreen, below in scrollback), so no reservation.
 export function companionReservedColumns(terminalColumns: number, speaking: boolean): number {
-  if (!feature('BUDDY')) return 0;
+  if (!isBuddyEnabled()) return 0;
   const companion = getCompanion();
   if (!companion || getGlobalConfig().companionMuted) return 0;
   if (terminalColumns < MIN_COLS_FOR_FULL_SPRITE) return 0;
@@ -212,7 +212,7 @@ export function CompanionSprite(): React.ReactNode {
     return () => clearTimeout(timer);
     // eslint-disable-next-line react-hooks/exhaustive-deps -- tick intentionally captured at reaction-change, not tracked
   }, [reaction, setAppState]);
-  if (!feature('BUDDY')) return null;
+  if (!isBuddyEnabled()) return null;
   const companion = getCompanion();
   if (!companion || getGlobalConfig().companionMuted) return null;
   const color = RARITY_COLORS[companion.rarity];
@@ -337,7 +337,7 @@ export function CompanionFloatingBubble() {
     t3 = $[4];
   }
   useEffect(t2, t3);
-  if (!feature("BUDDY") || !reaction) {
+  if (!isBuddyEnabled() || !reaction) {
     return null;
   }
   const companion = getCompanion();

src/buddy/feature.ts

@@ -0,0 +1,3 @@
+export function isBuddyEnabled(): boolean {
+  return true
+}

src/buddy/observer.ts

@@ -0,0 +1,65 @@
+import type { Message } from '../types/message.js'
+import { getGlobalConfig } from '../utils/config.js'
+import { getUserMessageText } from '../utils/messages.js'
+import { getCompanion } from './companion.js'
+
+const DIRECT_REPLIES = [
+  'I am observing.',
+  'I am helping from the corner.',
+  'I saw that.',
+  'Still here.',
+  'Watching closely.',
+] as const
+
+const PET_REPLIES = [
+  'happy chirp',
+  'tiny victory dance',
+  'quietly approves',
+  'wiggles with joy',
+  'looks pleased',
+] as const
+
+function hashString(s: string): number {
+  let h = 2166136261
+  for (let i = 0; i < s.length; i++) {
+    h ^= s.charCodeAt(i)
+    h = Math.imul(h, 16777619)
+  }
+  return h >>> 0
+}
+
+function pickDeterministic<T>(items: readonly T[], seed: string): T {
+  return items[hashString(seed) % items.length]!
+}
+
+export async function fireCompanionObserver(
+  messages: Message[],
+  onReaction: (reaction: string | undefined) => void,
+): Promise<void> {
+  const companion = getCompanion()
+  if (!companion || getGlobalConfig().companionMuted) return
+
+  const lastUser = [...messages].reverse().find(msg => msg.type === 'user')
+  if (!lastUser) return
+
+  const text = getUserMessageText(lastUser)?.trim()
+  if (!text) return
+
+  const lower = text.toLowerCase()
+  const companionName = companion.name.toLowerCase()
+
+  if (lower.includes('/buddy')) {
+    onReaction(pickDeterministic(PET_REPLIES, text + companion.name))
+    return
+  }
+
+  if (
+    lower.includes(companionName) ||
+    lower.includes('buddy') ||
+    lower.includes('companion')
+  ) {
+    onReaction(
+      `${companion.name}: ${pickDeterministic(DIRECT_REPLIES, text + companion.personality)}`,
+    )
+  }
+}

src/buddy/prompt.ts

@@ -1,8 +1,8 @@
-import { feature } from 'bun:bundle'
 import type { Message } from '../types/message.js'
 import type { Attachment } from '../utils/attachments.js'
 import { getGlobalConfig } from '../utils/config.js'
 import { getCompanion } from './companion.js'
+import { isBuddyEnabled } from './feature.js'
 
 export function companionIntroText(name: string, species: string): string {
   return `# Companion
@@ -15,7 +15,7 @@ When the user addresses ${name} directly (by name), its bubble will answer. Your
 export function getCompanionIntroAttachment(
   messages: Message[] | undefined,
 ): Attachment[] {
-  if (!feature('BUDDY')) return []
+  if (!isBuddyEnabled()) return []
   const companion = getCompanion()
   if (!companion || getGlobalConfig().companionMuted) return []
 

src/buddy/useBuddyNotification.tsx

@@ -1,10 +1,10 @@
 import { c as _c } from "react-compiler-runtime";
-import { feature } from 'bun:bundle';
 import React, { useEffect } from 'react';
 import { useNotifications } from '../context/notifications.js';
 import { Text } from '../ink.js';
 import { getGlobalConfig } from '../utils/config.js';
 import { getRainbowColor } from '../utils/thinking.js';
+import { isBuddyEnabled } from './feature.js';
 
 // Local date, not UTC — 24h rolling wave across timezones. Sustained Twitter
 // buzz instead of a single UTC-midnight spike, gentler on soul-gen load.
@@ -50,7 +50,7 @@ export function useBuddyNotification() {
   let t1;
   if ($[0] !== addNotification || $[1] !== removeNotification) {
     t0 = () => {
-      if (!feature("BUDDY")) {
+      if (!isBuddyEnabled()) {
         return;
       }
       const config = getGlobalConfig();
@@ -80,7 +80,7 @@ export function findBuddyTriggerPositions(text: string): Array<{
   start: number;
   end: number;
 }> {
-  if (!feature('BUDDY')) return [];
+  if (!isBuddyEnabled()) return [];
   const triggers: Array<{
     start: number;
     end: number;