Documentation namespace cleanup (issue #38).
Audit outcome:
- `date` vs `datetime` are NOT duplicates — `Date` is calendar days since the
epoch, `DateTime` is instants (seconds); distinct runtime namespaces. Kept
both.
- `network` vs `networking` WAS a real duplicate. Every other stdlib area
documents only its namespace (`World.*`, `Screen.*`, …), never the bare
builtins it lowers to. Networking alone also documented the low-level
`net_*`/builtin forms under `networking/`, duplicating the `Network.*`
pages under `network/`. Removed `networking/`; `network/` (the `Network`
namespace, which the compiler and LSP both expose) is canonical. Folded the
`@Sync`/`@Owned` framing into `network/_section.md` so no context is lost.
- Dropped the `networking` key from docgen inventory.json.
Guard (AC3): `tools/docgen/check.py` now fails if any `ns:` is documented from
more than one directory, or if two sections share an id or (case-folded)
title — so a duplicate-namespace split cannot silently reappear.
`gen.py` + `check.py` pass (34 sections, 365 symbols).
Closes#38
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>