No SQL text in the cache logic any more. Statements live in two files,
parsed by sqlStatements (`-- name:` sections, as in finquick's
brcal/gcbook.js) and imported as text (wrangler Text rule for *.sql):
- cache-read.sql: selects only, checked when the module loads
- cache-write.sql: schema, the v2 renumbering, etch, drops
store.ts turns them into two frozen facets with domain methods:
makeReader(sql) runs only the read statements (page, knownTotal,
deepestPageSince, pagesThrough); makeWriter(storage) only the write
ones (migrate, etch, dropPagesThrough), each change one transaction.
The cache migrates in its constructor under blockConcurrencyWhile, as
Cloudflare recommends, so readers never meet missing tables; the
migration test plants v1 storage and evicts to get a fresh activation.
A viewer() facet (PageViewer: stored pages and fill progress, from the
reader alone) is added for the public page.
Pure refactor: stored state and behavior unchanged.
Generated-by: Claude Opus 5.5
