Add complete attach examples and a shell-first guide

[tony]

The shared attach guide now teaches tmux terminal commands and a complete shell script. The port menu opens a complete program for each of the thirteen languages, including imports, project files, pinned dependency setup and an isolated server launcher. Each program finds the exact work session and leaves the existing server running.

Examples that use testing helpers retain them, with a short note linking the port’s regular Server API. Example comments have a 100-column limit, including indentation.

Verification

• Executed the exact displayed setup for all thirteen ports on tmux 3.7c. Ran each program against tmux 3.2a and verified that work-extra is rejected on 3.7c. Existing servers survived both success and failure cases; all isolated fixtures were removed.
• Tested the root commands in real terminal sessions on tmux 3.2a and 3.7c: create, detach, reuse, explicit attach and removal. The complete shell script passed on both versions.
• Compared all forty displayed files and Copy button results with the native-tested bytes at 1440px and 390px. Checked the shared guide’s prompt-free copied commands, port navigation, Server links, search and Markdown/JSON/LLM exports.
• The full local outer loop passed in 57 seconds. The focused example suite passed all 73 cases. Existing dangling-reference and linter diagnostics remain visible; the full publication audit runs separately in CI.

The native runner is python3 scripts/check-example-prose.py --example attach --port <port> --output-dir <new-directory>, with that port’s native tools and tmux on PATH. The fixture records exact source revisions, commands and file hashes. Native execution is separate from the routine site test loop.