Make general guides runnable with tmux shell scripts

[tony]

General guides now teach tmux with complete shell scripts for setup, input, capture, queries and tests. Each script owns a private socket, reports failures and cleans up. The port dropdown opens language-specific explanations linked to the complete, verified capture and attach programs.

Add forty owned guide pages for the eight previously shared languages. Keep general shell instructions on the root pages, preserve existing guide anchors, and link Rust and C++ test-fixture guidance to each port's regular Server API. The example runner also executes the displayed shell files and rejects changes to their recorded bytes before running commands.

Validation:

• All five displayed scripts and setup commands pass on tmux 3.2a and 3.7c, including expected output and removal of private sockets.
• Ten deliberate failures cover empty and ambiguous queries, assertion failure, input timeout and cleanup failure. Cleanup failures report and retain the socket for recovery.
• The public runner passes all five guides; a changed file fails before creating an execution directory.
• Desktop and phone browser checks cover copied script bytes, eight port destinations for each guide, forty owned pages, and the regular Server links.
• All 88 complete-example tests pass. The final local outer loop passes in 45.6 seconds, including type, navigation and browser checks.
• Existing unresolved API mentions decrease from 23 to 20; no new unresolved mentions are introduced.

The saved shell examples use ordinary #!/bin/sh files. The capture guide explains that output exceeding the pane height moves into scrollback, which requires capture-pane -p -S - to retrieve. The final English render builds 2,980 pages; the guide audit checks 495 internal links and preserves the five root guides' existing anchors.