Problem: Argument type mismatches are excluded from EmmyLua checks.

Solution: Correct runtime annotations and calls, document local checker
workarounds, and enable the diagnostic.

AI-assisted

Problem: LuaLS struggles with the generics used in Nvim's runtime,
requiring broad diagnostic suppressions. Indexing is also slow.

Solution: Use EmmyLua for type checks in the build and CI. It offers
more sophisticated type checking, substantially better support for
generics, and much better flow analysis.

Correct the affected annotations. Use `@internal`, supported directly by
EmmyLua, instead of `@nodoc` for shared internal declarations, and
support it in the help parser.

AI-assisted

Problem:
`1-` does nothing from a directory buffer, because we are already in the
buffer-local CWD. It's also unintuitive that this mapping behaves
differently based on the resolved CWD.

Solution:
Have `1-` open the global CWD.

Problem:
`zipfile://{archive}::{entry}` is ambiguous: `::` is legal in both an
archive path and an entry path, so the separator cannot be identified.
Splitting at the last `::` reads archives correctly but breaks entries
that contain it, and the plugin then emits buffer names it cannot read
back.

Solution:
Address entries as `zip://{archive}/{entry}`, joining the two paths.
Resolve the split by walking components: the first one that is a regular
file is the archive, because a regular file cannot have children on disk.
Entry paths may then contain any character, and no escaping is needed.

zipPlugin.vim keeps its own scheme, so the Java ftplugin emits whichever
form matches the active plugin until the legacy package is removed.

Problem:
The bundled `zip` plugin is implemented in Vimscript, making it harder to
maintain and build on with Nvim's Lua runtime infrastructure.

Solution:
Add an opt-out `zip.lua` browser backed by `nvim.dir`, and disable the legacy
Vimscript implementation by moving it to `pack/dist/opt/zip/`. Load it with
`:packadd zip`.