fix: use stable tmux pane targets

[phasetr]

Intent

Fix tmux backend failures for project directories whose tmux window names contain target syntax characters such as dots. A window named dr-remote.jp was being passed to tmux as session:dr-remote.jp; tmux interpreted .jp as a pane selector, so mirror refresh reported [tmux pane closed] even though the pane was alive.

Also restore the expected workspace ergonomics: after setup or workspace switching, apply the current project's example window layout automatically when enkan-repl-setup-current-project-layout is loaded.

Finally, handle layout resolution when a session entry uses an alias whose real project name differs, such as er -> enkan-repl.

Changes

• Keep window names for Emacs-side metadata and buffer naming.
• Store stable tmux %pane_id in enkan tmux identifiers when available.
• Normalize tmux command targets such as send-keys, capture-pane, cwd lookup, kill, and alert capture to %pane_id.
• Preserve legacy session:window IDs for existing state and tests.
• Run the optional current-project layout command after successful setup.
• Run the optional current-project layout command after workspace switch state is loaded.
• Cover both direct workspace switching and workspace-list switching.
• Cover the implicit switch that happens after deleting the current workspace and loading a remaining workspace.
• Resolve layout session entries as either real project names or configured aliases.

Test plan

• make test (274 tests)
• make compile
• Byte compile examples/window-layouts.el with warnings as errors
• Byte compile enkan-repl-workspace-list.el with warnings as errors
• Regression tests added:
  • test-enkan-repl--terminal-tmux-start-dotted-window-uses-pane-id
  • test-enkan-repl--terminal-tmux--capture-pane-async-targets-pane-id
  • test-enkan-repl-setup-creates-workspace-standard-file
  • test-enkan-repl-setup-creates-workspace-center-file
  • test-enkan-repl-workspace-switch-runs-current-project-layout
  • test-workspace-list-switch-runs-current-project-layout
  • test-workspace-delete-current-runs-current-project-layout
  • test-workspace-layout-resolves-session-alias-to-project-name
• Manual tmux check: started /Users/sekine/dev/offisis/dr-remote.jp/, got id enkan-fix-test-97:dr-remote.jp|%29, verified capture via target %29.

[github-actions]

🎉 This PR is included in version 0.19.5 🎉

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