feat: add ccx urls/files CLI commands + bulk actions

[gavin-jeong]

Summary

• New CLI subcommands ccx urls and ccx files that auto-detect the Claude session in the same tmux window and print URLs/file paths to stdout (tab-separated, pipeable to fzf/awk/cut)
• Improved URL extraction: exclude unicode bullets, strip trailing markdown artifacts and concatenated words (GH, JIRA, Fix etc.), reject bare-domain URLs
• TUI: multi-select sessions now supports URLs (u) and Files (f) in the bulk actions menu, merging and deduplicating across sessions

Usage

ccx urls              # print URLs from same-window Claude session
ccx files             # print file paths
ccx urls | fzf        # pipe to fzf for selection
ccx files | wc -l     # count touched files

Test plan

• Run ccx urls in a tmux window with a Claude session running
• Run ccx files and verify file paths are correct
• Pipe output to fzf, grep, wc to verify tab-separated format
• In TUI, multi-select sessions, open actions menu, press u for URLs and f for files
• Verify URL cleanup removes trailing artifacts (GH, JIRA, bullets, markdown bold)