[BUG] --resume sessionId doesn't work in non-interactive (-p) mode

Environment

• Platform (select one):
• [X] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 0.2.120
• Operating System: macOS 15.4.1
• Terminal: iTerm2

Bug Description

Claude Code always creates new session in non-interactive mode

Steps to Reproduce

Run following commands:
claude -d --verbose --output-format json -p "say '10'" Get session_id from the response.
claude -d --verbose --resume SESSION_ID --output-format json -p "say '20'"
claude -d --verbose --resume SESSION_ID --output-format json -p "say '30'"
claude -d --verbose --resume SESSION_ID --output-format json -p "say all numbers i told you"

or at any point, you can enter interactive mode with claude --resume SESSION_ID and see history of the messages.

Actual Behavior

1. Numbers aren't repeated back, but using -c works.
2. JSON output of each execution has a different session_id. This is also true when using the -c option, even though it reuses the same session behind the scenes.

Expected Behavior

1. JSON output should have same session_id
2. --resume SESSION_ID should continue given session.