Add `hermes sessions browse` — a curses-based interactive session picker
with live type-to-search filtering, arrow key navigation, and seamless
session resume via Enter.
Features:
- Arrow keys to navigate, Enter to select and resume, Esc/q to quit
- Type characters to live-filter sessions by title, preview, source, or ID
- Backspace to edit filter, first Esc clears filter, second Esc exits
- Adaptive column layout (title/preview, last active, source, ID)
- Scrolling support for long session lists
- --source flag to filter by platform (cli, telegram, discord, etc.)
- --limit flag to control how many sessions to load (default: 50)
- Windows fallback: numbered list with input prompt
- After selection, seamlessly execs into `hermes --resume <id>`
Design decisions:
- Separate subcommand (not a flag on -c) — preserves `hermes -c` 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
Also fixes: removed redundant `import os` inside cmd_sessions stats
block that shadowed the module-level import (would cause UnboundLocalError
if browse action was taken in the same function).
Tests: 33 new tests covering curses picker, fallback mode, filtering,
navigation, edge cases, and argument parser registration.
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