fix(java): list dependencies' implementations after the project's in Go to Implementation

Go to Implementation on a type or method declared in a dependency (Runnable, a Spring interface) listed only the project's implementations once the project had one. openidea.java.implementations (java-usages 1.5.0) now answers {locations, complete}: complete when the type is declared in the sources, which no dependency implements. Its search also covers the project's Kotlin classes attached by the Kotlin bridge.

When the answer is not complete, ide-lsp passes those found first to the new lsp_goto_implementation channel and runs the standard request for the rest. The chooser opens with the project's implementations ("1 found, searching…") and fills in the dependencies' when the search ends; closing it cancels the search. Gutter markers keep the source-only answer for project types.

java/java-usages/README.md

@@ -57,7 +57,7 @@ is not a claim of full IntelliJ feature parity.
 ## Rebuild and delivery
 
 The checked-in jar is embedded by ide-sdk `include_bytes!`, installed as
-`java-usages-1.4.0.jar`, and added alongside existing initialization bundles.
+`java-usages-1.5.0.jar`, and added alongside existing initialization bundles.
 Users need no compiler, Maven or Python. Manifest/install version must change
 when replacing the bundle because OSGi caches bundles.
 
@@ -78,6 +78,11 @@ Version 1.3.0 adds the class-hierarchy refactoring commands; its reproducible SH
 Version 1.4.0 adds `openidea.java.implementations` (Go to Implementation in the workspace's
 source folders, before the standard request that also searches every dependency jar); its
 reproducible SHA-256 is `d7601493eda846811b4bb8bfe7f3d56e3234a45e663648210db3937cebc770a5`.
+Version 1.5.0 answers `{locations, complete}`: `complete` when the type is declared in the sources
+(no dependency implements it), otherwise the app also runs the standard request and adds the
+dependencies' implementations after the first ones. The search also covers the project's Kotlin
+classes attached by the Kotlin bridge; its reproducible SHA-256 is
+`7588748c2797f9da2beb209714a75c29b4e31b155f095329bfb7e399d807c20a`.
 
 ```sh
 export PATH=/path/to/jdk25/bin:$PATH
@@ -107,6 +112,7 @@ python3 java/java-usages/tests/verify.py /path/to/jdtls /path/to/lombok.jar
 python3 java/java-usages/tests/read-write.py /path/to/jdtls /path/to/lombok.jar > /tmp/read-write.json
 OPENIDEA_USAGES_INDEX_STRESS=1 python3 java/java-usages/tests/read-write.py /path/to/jdtls /path/to/lombok.jar > /tmp/read-write-indexed.json
 python3 java/java-usages/tests/hierarchy.py /path/to/jdtls
+python3 java/java-usages/tests/implementations.py /path/to/jdtls
 ```
 
 The harnesses select the JDT LS configuration for the current platform. The first