Show full subagents.lua source when expanded; guide toward templated promptsHEADmain

The expanded progress board capped the executed Lua at 128 lines (and 32KB),
so long workflow sources ended in an ellipsis even after Ctrl-O. Expanded
now renders the whole source; collapsed still shows the first four lines.

Add a "Program, don't transcribe" section to the system guidance so the
primary writes shorter sources: one [[template]] with {name} placeholders
filled by gsub with a table, loops over data instead of per-child copies,
shared system prompts in `agents`, and file references instead of quoted
contents. A single templating mechanism is named on purpose to remove
choice.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ETqhv5FVD8Z14BEBsXeHHC

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