The filter manual (1ed1602e) was reachable only by knowing /docs
already existed — nothing in the UI pointed at it (the parked manual
plan's open decision). Every filter-builder mount now carries a "?"
in its header linking to the guide (opens in a new tab so drawer and
editor state survive): the All Books drawer and the collection rules
page — the two mounts sharing FilterBuilderRows. The docs home
indexes the manual (guide, cookbook, generated field reference).
Two docs-loader fixes surfaced by pinning this:
- Folder URLs resolve to their index page: /docs/user/filters now
serves user/filters/index.md (the manual is a folder: guide +
cookbook + generated reference); previously only root /docs had
index handling.
- The docs folder path is resolved by walking upward (bounded):
`go test` runs test binaries from the PACKAGE directory, so the
relative "docs" path resolved to a folder that didn't exist there
and every /docs route 404'd in tests while working in prod —
found by the new pin, fixed so tests exercise the docs routes
exactly as prod serves them.
Pins: TestFilterHelpAffordance (folder URL serves the guide; drawer
and rules pages carry the link). internal/docs suite + full suite
green (239s).