Session history not visible in Claude Code terminal session picker

Description

Sessions created in Claude Code's integrated terminal are not visible in the session picker sidebar, even though the .jsonl session files exist on disk at ~/.claude/projects/<project-path>/.

Resuming sessions via claude --resume <session-id> works from a standalone terminal but not from within the Claude Code terminal.

Steps to Reproduce

1. Open Claude Code (terminal integration)
2. Have several prior sessions in a project directory
3. Session .jsonl files exist at ~/.claude/projects/<encoded-project-path>/
4. The sidebar session picker only shows today's sessions — older ones are missing
5. Running claude --resume <session-id> from within Claude Code terminal fails to load context
6. Running the same claude --resume <session-id> from a standalone macOS Terminal works correctly

Expected Behavior

• All prior sessions should appear in the session picker sidebar
• claude --resume should work from both Claude Code terminal and standalone terminal

Environment

• macOS (Darwin 23.4.0)
• Claude Code version: 2.1.45 (from session file metadata)

Additional Context

• The project's ~/.claude/projects/<path>/ directory has no sessions-index.json, while other projects do — this may be the root cause of the missing sidebar entries
• 11 session .jsonl files exist on disk with valid conversation data