docs: update README for the pool layout, add RECIPE.md
worthant
fbb9de3
README still described muse-glimmer as the current build and pipeline/ asa top-level directory. It now lists all four builds and points at eachmanifest for exact figures, and carries a table of what every tool readsand writes.RECIPE.md documents every recipe field: who reads it, what happens whenit is absent, and what changes when it changes. Three fields behave inways nothing previously said out loud: name selects the vocabulary sweep,add_bos_per_document defaults to true, and shares are weights rather thanpercentages.
