Resume picker only shows ~8 most recent sessions, older sessions not resumable

Description

The /resume session picker only displays approximately 8 of the most recent sessions, even when many more sessions exist. In my case, the sessions-index.json contains 19 sessions for a single project, but only ~8 are shown in the picker.

Additionally, attempting to resume an older session by its ID directly fails with "Session was not found", even though the session entry exists in sessions-index.json and the corresponding .jsonl file is present on disk.

Steps to Reproduce

1. Use Claude Code extensively in a project over several weeks, accumulating 15+ sessions
2. Name sessions with /rename for easy identification
3. Run /resume — only the ~8 most recent sessions appear in the picker
4. Try to resume an older session by ID: claude --resume <session-id> or /resume <session-id>
5. Get error: Session <id> was not found.

Expected Behavior

• The resume picker should show all sessions (with pagination/scrolling if needed)
• All sessions listed in sessions-index.json should be resumable by ID or name

Actual Behavior

• Only ~8 most recent sessions are shown in the picker
• Older sessions that exist in sessions-index.json cannot be resumed by ID (returns "not found")

Environment

• macOS (Darwin 25.2.0)
• Claude Code (latest as of 2026-02-09)

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