Reverse Search History (Ctrl+R)

What: Interactive command history search similar to bash's reverse-i-search

How to use:

# In the interactive prompt, press Ctrl+R
# Type your search query - matches appear from command history
# Press Ctrl+R again to cycle through matches
# Press Enter to execute, Escape/Tab to accept without executing

Details:

• Displays "bck-i-search: " prompt when active
• Shows "failing bck-i-search: " when no matches found
• Searches through full command history including pasted content
• Ctrl+C cancels and restores previous input
• Evidence: YNB() at line 429227, ZW5() at line 429311