feat: add manual tmux reattach commands

[phasetr]

Summary

• add manual enkan-repl-tmux-reattach command to restore persisted workspace state only when explicitly invoked
• avoid force-refreshing every restored workspace during reattach; if state is already current, reattach now returns without refreshing
• add enkan-repl-tmux-refresh-workspace to explicitly recreate/refresh tmux mirror buffers for the current workspace
• bind refresh to C-M-g and reattach to C-M-r in examples/keybinding.el
• update README.org to document manual reattach, explicit workspace refresh, consult/minibuffer refresh deferral, and that startup reattach is not automatic

Keybinding rationale

• C-M-g: refresh/update current workspace mirrors, using a lightweight repeatable key near the existing C-M workspace controls
• C-M-r: manual reattach/reconnect after Emacs restart, mnemonic for reattach/restore and intentionally separate from refresh

Freeze investigation

• enkan-repl-tmux-reattach only matters if that command is invoked; it is not an automatic startup path.
• The always-on path is the tmux mirror idle timer. It skips hidden buffers, but consult-buffer preview can temporarily display a mirror buffer in a live window, which previously made it eligible for synchronous tmux capture-pane during minibuffer completion.
• Timer refresh now defers while the minibuffer is active, so consult preview/listing cannot trigger mirror capture. Explicit commands (enkan-repl-tmux-refresh-current / enkan-repl-tmux-refresh-workspace) still force refresh by design.

Tests

• make test
• make compile
• make checkdoc

[github-actions]

🎉 This PR is included in version 0.19.0 🎉

The release is available on GitHub release

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