Adds pm/compass.toml with five workstreams (theme, logo, quarto, helpers,
packaging), the journal and decision-record scaffold, and a composed
.roborev.toml carrying nine project-specific review rules derived from the
package's actual conventions.
Also adds AGENTS.md as the cross-tool conventions file, wires project memory
into .agent/memory/ so it travels between machines, and untracks
tests/testthat/Rplots.pdf, which churned on every test run.
