Bash-style history search: prefix filtering with Up arrow and Ctrl+R cycling

Feature Request

Problem

Claude Code's terminal history search is limited compared to standard bash/readline behavior:

1. Up arrow doesn't filter by prefix — In bash, typing git com then pressing Up shows only history entries starting with git com (readline's history-search-backward). In Claude Code, Up always cycles through the entire history sequentially regardless of text on the current line.

1. Ctrl+R doesn't pre-populate — When text is already typed on the line and you press Ctrl+R, the search box opens blank instead of using the current line text as the initial search query.

1. Ctrl+R doesn't cycle through matches — In bash, pressing Ctrl+R repeatedly cycles through older matches. In Claude Code, this doesn't work — you get a single search result without the ability to cycle.

Expected Behavior

Match standard readline/bash history search:

• Up arrow with text: Filter history to entries starting with the current line prefix
• Ctrl+R pre-population: Use current line text as initial search query when opening reverse search
• Ctrl+R cycling: Repeated Ctrl+R presses should cycle through progressively older matches

Why This Matters

History search is a core workflow for power users who reuse and modify previous prompts. The current implementation requires manually retyping or searching from scratch each time, which adds friction to iterative workflows.