Summary

Adds hermes sessions browse — a curses-based interactive session picker with live type-to-search filtering. Partially addresses #718.

What This Does

hermes sessions browse              # Interactive picker
hermes sessions browse --source cli # Filter by source
hermes sessions browse --limit 100  # Load more sessions

The picker shows recent sessions with title/preview, last active time, source, and ID. Users can:

• Arrow keys to navigate through sessions
• Type characters to live-filter by title, preview, source, or session ID
• Backspace to edit the filter, Esc to clear filter (first) or quit (second)
• Enter to select and seamlessly resume the session
• q to quit (when not filtering)

After selecting a session, the picker seamlessly execs into hermes --resume <id>.

Design Decisions

• Separate subcommand, not a flag — hermes -c is preserved as-is for instant most-recent-session resume
• Uses curses (not simple_term_menu) per Known Pitfalls to avoid the arrow-key ghost-duplication rendering bug in tmux/iTerm
• Follows existing curses pattern from hermes_cli/tools_config.py
• Windows fallback: numbered list with input() prompt

What This Does NOT Do (remaining #718 scope)

• No --latest flag (not needed since hermes -c already does this)
• No sessions list -i flag (could be added later if desired)

Bug Fix

Removed a redundant import os inside the cmd_sessions stats block that shadowed the module-level import. This would cause UnboundLocalError when the browse action tried to use os.execvp since Python treats os as a local variable if any branch of the function contains import os.

Tests

33 new tests in tests/hermes_cli/test_session_browse.py:

• Curses picker navigation (Enter, Up, Down, Esc, q)
• Live search filtering (type-to-filter, backspace, Esc-clears-filter)
• Fallback mode (valid selection, cancel, invalid input, keyboard interrupt)
• Display logic (title vs preview vs ID, truncation, relative time)
• Edge cases (missing fields, single session, long titles)

All 2377+ tests pass, no regressions.

Live Testing

Verified interactively via tmux:

• Arrow navigation works without ghost duplication
• Type-to-filter narrows results in real time
• Esc clears filter first, then exits
• Enter + session selection seamlessly launches into resumed session

Closes #718