Remove Rust code, delegate server to nuwiki-rs repo

Delete all Rust crates (crates/) and Cargo files. The nuwiki-ls binary
is now built in the separate nuwiki-rs repository and downloaded at
install time from the Gitea release assets, with a cargo build fallback
that clones nuwiki-rs.

Update all documentation to reflect the split repo layout.

scripts/download_bin.vim

@@ -1,5 +1,5 @@
 " scripts/download_bin.vim — install `nuwiki-ls` from a release tarball,
-" falling back to `cargo build --release` on failure.
+" falling back to `cargo build --release` from the nuwiki-rs repo.
 "
 " Invoked by Dein / vim-plug build hooks:
 "   vim -e -s -c "source scripts/download_bin.vim" -c "q"
@@ -16,6 +16,7 @@ let s:plugin_dir = fnamemodify(resolve(expand('<sfile>:p')), ':h:h')
 let s:bin_dir    = s:plugin_dir . '/bin'
 let s:suffix     = has('win32') ? '.exe' : ''
 let s:bin        = s:bin_dir . '/nuwiki-ls' . s:suffix
+let s:rs_repo    = fnamemodify(s:plugin_dir, ':h:h') . '/nuwiki-rs'
 
 call mkdir(s:bin_dir, 'p')
 
@@ -44,13 +45,21 @@ function! s:build_from_source() abort
     echohl ErrorMsg | echom 'nuwiki: cargo not found, cannot build from source' | echohl None
     return 0
   endif
+  echom 'nuwiki: cloning nuwiki-rs …'
+  if !filereadable(s:rs_repo . '/Cargo.toml')
+    call system('git clone --depth 1 https://code.gfran.co/gffranco/nuwiki-rs.git ' . shellescape(s:rs_repo))
+    if v:shell_error != 0
+      echohl ErrorMsg | echom 'nuwiki: failed to clone nuwiki-rs' | echohl None
+      return 0
+    endif
+  endif
   echom 'nuwiki: cargo build --release …'
-  call system('cargo build --release -p nuwiki-ls --manifest-path ' . shellescape(s:plugin_dir . '/Cargo.toml'))
+  call system('cargo build --release -p nuwiki-ls --manifest-path ' . shellescape(s:rs_repo . '/Cargo.toml'))
   if v:shell_error != 0
     echohl ErrorMsg | echom 'nuwiki: cargo build failed' | echohl None
     return 0
   endif
-  let l:built = s:plugin_dir . '/target/release/nuwiki-ls' . s:suffix
+  let l:built = s:rs_repo . '/target/release/nuwiki-ls' . s:suffix
   call system('cp ' . shellescape(l:built) . ' ' . shellescape(s:bin))
   call system('chmod +x ' . shellescape(s:bin))
   return executable(s:bin)
@@ -64,10 +73,7 @@ function! s:download_release() abort
   if !executable('curl') || !executable('tar')
     return 0
   endif
-  " Gitea serves the most recent release under the `latest` tag segment
-  " (/releases/download/latest/<asset>). NOT GitHub's
-  " /releases/latest/download/<asset> shape, which Gitea 404s.
-  let l:url = 'https://code.gfran.co/gffranco/nuwiki/releases/download/latest/nuwiki-ls-'
+  let l:url = 'https://code.gfran.co/gffranco/nuwiki-rs/releases/download/latest/nuwiki-ls-'
         \ . l:target . '.tar.gz'
   let l:archive = tempname() . '.tar.gz'
   call system('curl -fsSL -o ' . shellescape(l:archive) . ' ' . shellescape(l:url))
@@ -85,11 +91,7 @@ function! s:download_release() abort
   return executable(s:bin)
 endfunction
 
-if get(g:, 'nuwiki_build_from_source', 0)
-  if !s:build_from_source()
-    echohl ErrorMsg | echom 'nuwiki: source build failed' | echohl None
-  endif
-elseif s:download_release()
+if s:download_release()
   echom 'nuwiki: installed ' . s:bin
 else
   echohl WarningMsg | echom 'nuwiki: download failed, falling back to source build' | echohl None

scripts/set-version.sh

@@ -1,57 +0,0 @@
-#!/usr/bin/env bash
-# scripts/set-version.sh — stamp a release version into every hardcoded spot.
-#
-# This is the single source of truth for *where* the version lives. The
-# release pipeline (.gitea/workflows/release.yaml) calls it with the
-# workflow-dispatch input; run it the same way to prepare a release by hand:
-#
-#   scripts/set-version.sh 0.4.0
-#
-# It rewrites:
-#   1. Cargo.toml                 — [workspace.package] version
-#   2. crates/nuwiki-lsp/Cargo.toml — nuwiki-core path-dep version pin
-#   3. crates/nuwiki-ls/Cargo.toml  — nuwiki-lsp  path-dep version pin
-#   4. plugin/nuwiki.vim          — g:nuwiki_version (the Lua client reads it too)
-#   5. Cargo.lock                 — the version of our three own crates
-#
-# Cargo.lock is patched directly (awk) so this needs no cargo/toolchain —
-# the only thing that changes for our crates is their version string.
-set -euo pipefail
-
-ver="${1:-}"
-ver="${ver#v}" # tolerate a leading "v"
-if ! printf '%s' "$ver" | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+([-.][0-9A-Za-z.-]+)?$'; then
-  echo "usage: $0 <semver>   e.g. $0 0.4.0" >&2
-  exit 2
-fi
-
-root="$(cd "$(dirname "$0")/.." && pwd)"
-cd "$root"
-
-# 1. Workspace package version (root Cargo.toml, [workspace.package]).
-sed -i -E "s/^version = \"[0-9][^\"]*\"/version = \"$ver\"/" Cargo.toml
-
-# 2-3. Internal path-dep pins must track the workspace version.
-sed -i -E "s|(nuwiki-core = \{ path = \"\.\./nuwiki-core\", version = )\"[^\"]*\"|\1\"$ver\"|" \
-  crates/nuwiki-lsp/Cargo.toml
-sed -i -E "s|(nuwiki-lsp = \{ path = \"\.\./nuwiki-lsp\", version = )\"[^\"]*\"|\1\"$ver\"|" \
-  crates/nuwiki-ls/Cargo.toml
-
-# 4. VimL client version global (the Lua client reads this same g: var).
-sed -i -E "s/(let g:nuwiki_version = ')[^']*(')/\1$ver\2/" plugin/nuwiki.vim
-
-# 5. Cargo.lock entries for our own crates. Each [[package]] block lists the
-#    name line immediately followed by the version line; rewrite only those.
-for crate in nuwiki-core nuwiki-lsp nuwiki-ls; do
-  awk -v c="$crate" -v v="$ver" '
-    $0 == "name = \"" c "\"" {
-      print
-      if (getline > 0) { sub(/version = "[^"]*"/, "version = \"" v "\"") }
-      print
-      next
-    }
-    { print }
-  ' Cargo.lock > Cargo.lock.tmp && mv Cargo.lock.tmp Cargo.lock
-done
-
-echo "Set version to $ver"