feat(tooling): JetBrains IDE support, LSP navigation, barrel imports, package scripts and hooks

- JetBrains plugin 1.4.0: semantic colours (builtin / vendor / own), template strings,
  brace handling, run configurations and a test console, package.ludic and
  package.lock.ludic editing (completion, docs, app preview, colour previews, asset
  navigation), External Libraries for the runtime and packages, doc pages for built-ins
- ludic-lsp: go to definition for imports, document links, hover with inferred types,
  type definition, signature help with parameters, docs from docs/language
- `import "dir"` resolves a barrel `dir/index.ludic`
- package.ludic `entry`, `script` and `hook before|after <command>`; `ludic <script>`,
  `ludic script`, `ludic scripts`
- `ludic test --verbose` and `--test NAME`; the test runner filters by name

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tools/ludic-cli/release.ludic

@@ -330,6 +330,9 @@ function build_artifacts(ver: pointer) -> bool {
     }
     shell(`cp -R runtime {stage}/runtime`)
     shell(`cp -R packages {stage}/packages`)
+    # the language reference: ludic-lsp indexes it for hover and go-to-definition
+    # on built-ins (docs/language/**.md, ~4 MB of markdown)
+    shell(`mkdir -p {stage}/docs && cp -R docs/language {stage}/docs/language`)
     shell(`cp VERSION LICENSE README.md {stage}/`)
     # the Linux link needs the Darwin-stdio shim injected through $LUDIC_CC; it
     # travels with the toolchain that needs it (see tools/ci/linux_stdio_shim.ll).