[BUG] /rename without arguments fails with "no conversation context yet" despite active conversation

Description

The /rename command's auto-generate feature (added in v2.1.41) fails with the error "Could not generate a name: no conversation context yet" even when called in a session with extensive conversation history.

Steps to reproduce

1. Start a Claude Code session
2. Have a multi-turn conversation (10+ exchanges including tool use and web searches)
3. Run /rename without arguments
4. Observe the error: Could not generate a name: no conversation context yet. Usage: /rename <name>
5. Retry /rename later in the same session, same error persists

Expected behavior

/rename without arguments should auto-generate a descriptive session name based on the conversation context, as documented in the v2.1.41 changelog: "Improved /rename to auto-generate session name from conversation context when called without arguments."

Actual behavior

Every invocation returns: Could not generate a name: no conversation context yet. Usage: /rename <name>

The session clearly has context (extensive multi-turn conversation), so the "no conversation context yet" message is incorrect.

Environment

• Claude Code version: 2.1.45
• OS: macOS (Darwin 25.3.0)
• Shell: zsh

Additional context

• The feature was introduced in v2.1.41 per the changelog
• Issue #25455 confirms the auto-generate feature exists but docs haven't been updated
• Providing a name explicitly (/rename my-name) works fine
• Tested multiple times in the same session with the same result