The AI chat was using both --resume (CLI session resumption) AND formatted
conversation history in the prompt simultaneously. This dual-context approach
confused the model — it saw the conversation twice (from session + from prompt
markup), leading to "I don't have context" responses on follow-ups.
Fix: remove --resume entirely from chat mode. Each CLI call is now independent,
with full conversation history formatted into the prompt via
<conversation_history> markup. trimHistory handles graceful truncation.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add trimHistory() to keep most recent messages within 100k token budget
- Add formatMessageWithHistory() to prepend conversation context to each message
- Wire up in useAIChat.ts: sendMessage now includes full history
- Keep --resume as belt-and-suspenders for same-session continuity
- 14 new tests in ai-chat.test.ts and useAIChat.test.ts
