Expand and version-neutralize the tmux start wrapper

[mrfloris]

What changed

• Make the wrapper header independent of Minecraft, Paper, Java, and architecture versions.
• Add --version, --doctor, --start [name], --list, and --dry-run [name].
• Share one safely quoted tmux argument vector between real startup and dry-run.
• Resolve both tmux and sleep before startup side effects.
• Expand the fake-tmux package and documentation for the new command contracts.

Why

The wrapper can now diagnose and preview its launch safely, expose its own version, and offer explicit start/list conveniences without taking over Paper lifecycle management. Resolving sleep before session creation also prevents a liveness-probe dependency failure after tmux has already started a session.

User impact

• Legacy ./1MB-start.sh [name] behavior remains supported.
• --doctor is read-only and does not query a tmux session or execute the launcher.
• --dry-run invokes neither tmux, sleep, nor 1MB-minecraft.sh.
• --list emits one current-user tmux session name per line and preserves tmux's exit status.

Validation

• Resources/Server/tests/1MB-start/run-tests.sh all
• Bash 3.2 syntax and behavior passed.
• Bash 5.3 syntax and behavior passed.
• ShellCheck passed.
• 65 passed, 0 failed, 0 skipped.
• git diff --check passed.
• Independent focused reviews found no remaining blockers.