Returns the text of inst/llm/primer.md as a single string. Intended
for use as the system_prompt = (or equivalent) argument when wiring
ggpaintr into an LLM client such as ellmer, so the model knows when
to reach for ggpaintr and at which of the three integration levels.
Details
The primer is short by design — it establishes the extensibility
model and points the model at ptr_llm_topic() for runnable
examples. A companion tool that exposes ptr_llm_topic() to the
model lets it pull only the example it needs, instead of loading
every topic into the system prompt.
