Phase 5a: add configurable Jai module roots

README.md

@@ -17,16 +17,16 @@ never from online material (see `AGENTS.md`).
 - Comment / uncomment (`//` and nesting `/* */`)
 - Brace matching, including the Jai-only `.{` struct-literal and `.[`
   array-literal openers
-- Basic completion for keywords, directives, and local Jai module/file paths
+- Basic completion for keywords, directives, and Jai module/file paths
+- Project settings for ordered Jai module/import roots
 - Go-to-definition for procedures and types in the same file and through
-  `#import`/`#load`
+  `#import`/`#load`, including configured external roots
+- Indexed external Jai roots so find-usages can cross project/library boundaries
 - Rename and find-usages for declaration names and their resolved references
 
 Remaining code-insight gaps include module-qualified members, parameters, and
-struct fields. The next planned increment is configurable project module/import
-roots, including indexed search scope for external standard-library and custom
-module directories. Formatting, inspections, and compiler integration are
-planned later. See `docs/BUILD_PLAN.md` for the phase plan.
+struct fields. Formatting, inspections, and compiler integration are planned
+later. See `docs/BUILD_PLAN.md` for the phase plan.
 
 ## Install it locally
 
@@ -39,7 +39,9 @@ In the IDE: **Settings → Plugins → ⚙ → Install Plugin from Disk…**, pi
 ZIP, restart when prompted. Requires build 253 (2025.3) or newer; verified
 compatible with IU-253, IU-261 and IU-262 by the JetBrains Plugin Verifier.
 
-To try it, open any file from `~/.local/jai/how_to/`.
+To try it, open any file from `~/.local/jai/how_to/`. Configure additional
+module/import directories under **Settings → Languages & Frameworks → Jai**;
+configured roots are searched in order and indexed as Jai library sources.
 
 Uninstall or update the same way — installing a new ZIP over the old one
 replaces it.