iconvex_icu_archive

# Iconvex ICU Archive

Optional facade for the historical ICU mapping-table archive. Installing this
package brings in all six version-locked data shards while keeping the large
archive out of ordinary Iconvex feature packages.

```elixir
def deps do
  [
    {:iconvex, "~> 0.1"},
    {:iconvex_icu_archive, "~> 0.1"}
  ]
end
```

The facade registers 1,050 source-qualified codecs. Its numbered,
provider-only shards serve their mapping tables through the public Iconvex
Core provider API. Canonical identities preserve the exact historical ICU
source filename and revision, for example:

```elixir
{:ok, utf8} =
  Iconvex.convert(
    bytes,
    "ICU-ARCHIVE-ibm-930_P120-1999",
    "UTF-8"
  )
```

Aliases are collision-reviewed across the frozen surface. Installing one
ordinary feature package never pulls this archive; installing the facade
explicitly brings in all six version-locked data shards.

For a sibling source checkout, set `ICONVEX_PATH` to the Core package and
`ICONVEX_ARCHIVE_PATH` to the workspace directory containing this package and
all six `iconvex_icu_archive_data_XX` directories. Published builds leave both
variables unset and use Hex dependencies.