fix(java): remove unused IntelliCode integration

docs/02-usage/050_configuration.md

@@ -666,8 +666,7 @@ Supported settings:
 Java support has two installation modes:
 
 1. **Default vscode-java VSIX mode** (no extra config required): Serena downloads the platform-specific
-   vscode-java VSIX (~500 MB: JDTLS + bundled JRE 21 + Lombok + IntelliCode), Gradle distribution and
-   IntelliCode VSIX from public hosts on first use.
+   vscode-java VSIX (JDTLS + bundled JRE 21 + Lombok) and a Gradle distribution from public hosts on first use.
 2. **Upstream JDTLS mode** (offline-friendly): Activated by setting both `jdtls_path` and `lombok_path`.
    Uses an existing JDTLS installation (~100 MB) and the system JDK 21+. Nothing is downloaded.
    Recommended for restricted-network/corporate environments.
@@ -677,9 +676,8 @@ Java support has two installation modes:
 - **Default vscode-java VSIX mode** — recommended for most users. No setup required;
   Serena downloads everything on first use.
 - **Upstream JDTLS mode** — recommended when:
-  - you cannot reach `github.com`, `services.gradle.org` or `marketplace.visualstudio.com`
-    from the host (corporate proxy, air-gapped network);
-  - you want a smaller on-disk footprint (~100 MB vs ~500 MB);
+  - you cannot reach `github.com` or `services.gradle.org` from the host (corporate proxy, air-gapped network);
+  - you want a smaller on-disk footprint;
   - you already maintain a JDTLS installation (e.g. for `nvim-jdtls` or another editor);
   - your security policy prohibits per-project runtime downloads.
 
@@ -702,23 +700,19 @@ The following settings are supported for the Java language server:
 | `runtimes` | `[]` | Extra JRE/JDK entries registered with JDT-LS via `java.configuration.runtimes`. Use this when a project's source/target level exceeds the JDK JDT-LS itself runs on (currently JDK 21 in default vscode-java VSIX mode). Each entry is a mapping with required `name` (e.g. `JavaSE-25`, matching the `JavaSE-NN` container the build tool requests) and `path` (JDK/JRE home directory; must exist), plus optional `default`, `sources`, and `javadoc` (passed through to JDT-LS). Entries extend rather than replace the bundled `JavaSE-21` runtime; an entry that reuses the `JavaSE-21` name overrides the bundled one. Changing this setting invalidates the JDTLS workspace hash so a fresh import is performed. |
 | `gradle_version` | `8.14.2` | (vscode-java mode only) Override the Gradle distribution version Serena downloads by default. |
 | `vscode_java_version` | `1.54.0-923` | (vscode-java mode only) Override the bundled `vscode-java` runtime bundle version Serena downloads by default. |
-| `intellicode_version` | `1.2.30` | (vscode-java mode only) Override the IntelliCode VSIX version Serena downloads by default. |
 | `lombok_show_generated` | `true` | Show Lombok-generated methods (`getX/setX`, `builder()`, `equals/hashCode/toString`, `withX`, fluent accessors) in `find_symbol`, `get_symbols_overview` and the symbol-edit tools. Set to `false` to restore the previous JDTLS default and hide the synthetic methods (e.g. when `@Data` classes pollute the outline with too many getters/setters). Requires JDTLS commit `b2d8952` / `vscode-java >= 1.53.0`; the bundled default already meets this. |
 | `jdtls_xmx` | `3G` | Maximum heap size for the JDTLS server JVM. |
 | `jdtls_xms` | `100m` | Initial heap size for the JDTLS server JVM. |
-| `intellicode_xmx` | `1G` | (vscode-java mode only) Maximum heap size for the IntelliCode embedded JVM. |
-| `intellicode_xms` | `100m` | (vscode-java mode only) Initial heap size for the IntelliCode embedded JVM. |
 
 Notes:
 - When overriding `vscode_java_version`, Serena still assumes that the downloaded runtime bundle keeps the same internal
   directory layout and file names as the bundled default version.
-- In upstream-jdtls mode, IntelliCode is not loaded (it's an ML completions ranker that is irrelevant to Serena's
-  symbol-tools workflow), and Serena does not ship a Gradle distribution. Maven projects work via JDTLS's bundled m2e.
+- Serena does not download or load IntelliCode because its completion ranking is not used by Serena's tools. The retired
+  `intellicode_version`, `intellicode_xmx` and `intellicode_xms` keys remain accepted and ignored so existing
+  configurations continue to load; they can be removed.
+- In upstream-jdtls mode Serena does not ship a Gradle distribution. Maven projects work via JDTLS's bundled m2e.
   Gradle projects must have `./gradlew` in the project, or rely on a system-installed Gradle through Buildship's
-  default discovery rules.
-- In upstream-jdtls mode the `gradle_version`, `vscode_java_version`, `intellicode_version`,
-  `intellicode_xmx`, `intellicode_xms` settings are silently ignored — they only apply to the
-  vscode-java VSIX mode.
+  default discovery rules. The `gradle_version` and `vscode_java_version` settings are silently ignored in this mode.
 - Without `runtimes`, JDT-LS only knows about the bundled `JavaSE-21` JRE. Projects that request a newer
   container (e.g. `sourceCompatibility = JavaVersion.VERSION_25`) then fail to resolve JDK types such as
   `java.lang.Object`. Register the matching installed JDK via `runtimes` instead of symlinking over Serena's