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Make great documentation goal 1.2, and plan the README's reorganisation and the nested-template gaps #33

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@@ -258,7 +258,7 @@ GoReleaser attaches the binaries to the release the tag workflow publishes, and
### 26. Spell `sv_SE.personnummer` with the `+` Skatteverket uses from the year the holder turns 100, judged by a date the caller gives.
The format hard-codes `-`, and its earliest birthdate, 1930-01-01, makes the oldest draws invalid from 2030. A system holding Swedish personnummer often breaks on the `+`, so a fixture carrying one is a valuable test. Whether a number takes `+` depends on the date it is read, and the decision "No builtin reads the clock, so a date is bounded by days, never by an age" forbids a builtin from reading that date off the clock. This item revises it: once the caller gives the date, an age is a bound, and the CLI's default date makes output change with the day it runs unless the flag is given. Do the first step before the rest:
- Explore how a caller passes input data, such as the date a number is read on, to a render: in the template, as a plain option, or both. The library requires every input that can change, such as the date and the randomness; the CLI defaults to the system's when its flag is absent. Bench the spelling; `--now` reads like the clock. Shape the input so it can later narrow the draws to adults, children, 65 and over, or a mix, and so let a test ask for a centenarian; narrowing itself waits for its own item. Requiring the randomness changes `New`, which today seeds itself without `WithSeed`; split that into its own item when this one is picked.
- Explore how a caller passes input data, such as the date a number is read on, to a render: in the template, as a plain option, or both. Make the library require every input that can change, such as the date and the randomness, and let the CLI default each to the system's when its flag is absent. Bench the spelling; `--now` reads like the clock. Shape the input so it can later narrow the draws to adults, children, 65 and over, or a mix, and so let a test ask for a centenarian; narrowing itself waits for its own item. Requiring the randomness changes `New`, which today seeds itself without `WithSeed`; split that into its own item when this one is picked.
- Draw birthdates back past 100 years before the given date, so a `+` can appear. Read in 2026, the oldest shipped birthdate is 96 years old, so no draw carries a `+` until 2030. Skatteverket's test series reaches back to 1890, with birth numbers 980/981 before 1900. Draw no birthdate after the given date.
- Weight the ages by the territory's population, so the share of `+` numbers follows its demography: [research-age-bands.md](docs/research/research-age-bands.md).
- Let a data author's own category spell the separator too, through a builtin or a function a data module provides (item 77), and update the README's personnummer recipe and its "a day in 1930–2025" count.