RIDER-140279 [rider-mcp]: return code-style warnings from get_file_problems/lint_files

The backend error checker protocol expressed severity as a two-valued
BackendErrorSeverity (WARNING/ERROR), so after MCP lint switched to the
backend error checker channel, ReSharper highlightings below WARNING
(HINT/SUGGESTION — e.g. "use var", missing braces) could neither be
requested nor transmitted, and get_file_problems(errorsOnly=false)
silently dropped them.

Widen BackendErrorSeverity to Error/Warning/Suggestion/Hint: a "warning"
request now travels as Hint and is filtered on the backend as
Severity.HINT, so HINT/SUGGESTION problems are collected and reported as
WEAK WARNING. Additionally, honor the new
DaemonCustomDataConstants.MinimalSeverityKey in the daemon dispatcher:
the error-check daemon runs as SOLUTION_ANALYSIS, where the default SWEA
warnings mode (DoNotShowAndDoNotRun) used to raise the minimal severity
to ERROR and skip hint-only analyzers entirely.

Also extract the platform LintMinSeverity enum into
LintFilesRequestSupport and reuse it in RiderAnalysisToolset instead of
hardcoded "warning"/"error" severity strings.

RIDER-140279 fix


IJ-MR-214874

GitOrigin-RevId: 083b40375865c0bfcce79248a47e47884e221a39

plugins/mcp-server/src/com/intellij/mcpserver/toolsets/general/AnalysisToolset.kt

@@ -11,7 +11,6 @@ import com.intellij.build.events.FileMessageEvent
 import com.intellij.build.events.FinishBuildEvent
 import com.intellij.build.events.MessageEvent
 import com.intellij.build.events.StartBuildEvent
-import com.intellij.lang.annotation.HighlightSeverity
 import com.intellij.mcpserver.McpProjectDependenciesProvider
 import com.intellij.mcpserver.McpServerBundle
 import com.intellij.mcpserver.McpToolset
@@ -109,7 +108,7 @@ class AnalysisToolset : McpToolset {
     currentCoroutineContext().reportToolActivity(McpServerBundle.message("tool.activity.collecting.file.problems", filePath))
     val lintResult = collectLintFiles(
       filePaths = listOf(filePath),
-      minSeverityValue = if (errorsOnly) LintMinSeverity.ERROR.apiValue else LintMinSeverity.WARNING.apiValue,
+      minSeverityValue = LintMinSeverity.fromErrorsOnly(errorsOnly).apiValue,
       timeout = timeout,
       progressTitle = McpServerBundle.message("progress.title.analyzing.file", filePath.substringAfterLast('/').substringAfterLast('\\')),
     )
@@ -571,18 +570,3 @@ class AnalysisToolset : McpToolset {
     @JvmField val dependencies: List<DependencyInfo>,
   )
 }
-
-private enum class LintMinSeverity(
-  @JvmField val apiValue: String,
-  @JvmField val highlightSeverity: HighlightSeverity,
-) {
-  WARNING("warning", HighlightSeverity.WEAK_WARNING),
-  ERROR("error", HighlightSeverity.ERROR);
-
-  companion object {
-    fun parse(value: String): LintMinSeverity {
-      val normalized = value.trim().lowercase()
-      return entries.firstOrNull { it.apiValue == normalized } ?: mcpFail("min_severity must be one of: warning, error")
-    }
-  }
-}

plugins/mcp-server/src/com/intellij/mcpserver/toolsets/general/LintFilesRequestSupport.kt

@@ -1,11 +1,30 @@
 package com.intellij.mcpserver.toolsets.general
 
+import com.intellij.lang.annotation.HighlightSeverity
 import com.intellij.mcpserver.mcpFail
 import com.intellij.mcpserver.util.projectDirectory
 import com.intellij.openapi.project.Project
 import org.jetbrains.annotations.ApiStatus.Internal
 import java.nio.file.Path
 
+@Internal
+enum class LintMinSeverity(
+  @JvmField val apiValue: String,
+  @JvmField val highlightSeverity: HighlightSeverity,
+) {
+  WARNING("warning", HighlightSeverity.WEAK_WARNING),
+  ERROR("error", HighlightSeverity.ERROR);
+
+  companion object {
+    fun parse(value: String): LintMinSeverity {
+      val normalized = value.trim().lowercase()
+      return entries.firstOrNull { it.apiValue == normalized } ?: mcpFail("min_severity must be one of: warning, error")
+    }
+
+    fun fromErrorsOnly(errorsOnly: Boolean): LintMinSeverity = if (errorsOnly) ERROR else WARNING
+  }
+}
+
 @Internal
 data class RequestedLintFile(
   @JvmField val requestedPath: String,