* fix(plugin): report missing files as not-found and add project exists/stat
read-file of a missing path now returns error::not-found in the host,
matching the SDK mock, instead of error::invalid. project gains
exists(path) for a cheap existence check (files and directories, hidden
and ignored included) and stat(path) for kind/size/modified, both
gated by project.read and refusing paths outside the root.
Fixes#1957
* chore: silence clippy in sandbox test and rebuild plugin components
- drop an unnecessary to_path_buf clippy flags on unix
- rebuild every checked-in plugin.wasm: the SDK and wit/ changed, so
their source fingerprints moved
* test(plugin): cover missing-file not-found and fix CRLF-only Windows failure
arookieofc
303d5950bf