Ten tasks, 58 steps, TDD throughout. Tasks 1-3 fix the P0 (manifest
enumeration, working default URL, and the live-corpus test whose absence
let the defect survive); 4-7 are metadata and packaging; 8-10 rewrite
README, NEWS and CONTRIBUTING.
Distribution mechanics stay out of scope -- r-universe publishes check
results on registration, so it comes after final verification is green.
15-task TDD plan covering: gov_population_yearly view, .attach_per_capita
per-year join, pop_source column + multi-note concatenation, cog_find_peers
year arg, cog_peer_compare cohort_year, rollup unavailable-pop exclusion,
provenance updates, cog_explain rendering, vignette, cog_pipeline data
dictionary, and NEWS entry.
Also corrects spec to match existing rollup semantics (side-by-side, not
summed) and adds /plans to .Rbuildignore.
jared