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>

changes/package-scripts.md

@@ -0,0 +1,10 @@
+bump: minor
+type: feat
+`package.ludic` gains `entry`, scripts and lifecycle hooks:
+- `entry "src/game.ludic"` names the program `ludic run`/`build`/`bundle` compile. Without
+  it, the one file under `src/` that declares a `program` is used.
+- `script "dev" "ludic run --headless"` defines a command: `ludic dev` (or `ludic script dev`)
+  runs it with any extra arguments, and `ludic scripts` lists them.
+- `hook before|after <command> "…"` wraps `build`, `run`, `test`, `bundle`, `pack`, `get`, …
+  or a script. A failing `before` hook stops the command; `after` hooks run only on success.
+- Quoted manifest values accept `\"` and `\\` escapes.