Document completion scope and gaps

README.md

@@ -18,15 +18,17 @@ never from online material (see `AGENTS.md`).
 - Brace matching, including the Jai-only `.{` struct-literal and `.[`
   array-literal openers
 - Basic completion for keywords, directives, and Jai module/file paths
+  (symbol-aware identifier completion is not implemented yet)
 - Project settings for ordered Jai module/import roots
 - Go-to-definition for procedures and types in the same file and through
   `#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. Formatting, inspections, and compiler integration are planned
-later. See `docs/BUILD_PLAN.md` for the phase plan.
+Remaining code-insight gaps include symbol-aware completion for declarations
+and imported symbols, plus module-qualified members, parameters, and struct
+fields. Formatting, inspections, and compiler integration are planned later.
+See `docs/BUILD_PLAN.md` for the phase plan.
 
 ## Install it locally