refactor(tools): fold research tools into :infrastructure:tools (drop new module)

The research feature is "no new architecture" (spec §1) — composition of existing
mechanisms. The only genuinely new code is the two web tools + the HTML→markdown
extractor (spec marks them "(new)"), and those belong with ShellTool/FileReadTool
in :infrastructure:tools, not in a separate module.

Moves extract/ + web/ from the short-lived :infrastructure:research module into
:infrastructure:tools (packages com.correx.infrastructure.tools.{extract,web}); adds
jsoup + ktor-client there; removes the module from settings.gradle. No behaviour change
— 44 tests green.

infrastructure/research/build.gradle

@@ -1,24 +0,0 @@
-plugins {
-    id 'java-library'
-    id 'org.jetbrains.kotlin.jvm'
-    id 'org.jetbrains.kotlin.plugin.serialization'
-}
-
-ext {
-    ktor_version = '3.0.3'
-}
-
-dependencies {
-    implementation project(":core:events")
-    implementation project(":core:tools")
-    implementation project(":core:approvals")
-    implementation 'org.jsoup:jsoup:1.20.1'
-    implementation "io.ktor:ktor-client-core:$ktor_version"
-    implementation "io.ktor:ktor-client-cio:$ktor_version"
-
-    testImplementation "io.ktor:ktor-client-mock:$ktor_version"
-}
-
-// Pure deterministic extraction utility; coverage gate is enforced via its own thorough
-// unit tests, not the global line-count bound (same stance as :infrastructure:tools).
-tasks.named("koverVerify").configure { enabled = false }

infrastructure/tools/build.gradle

@@ -4,6 +4,10 @@ plugins {
     id 'org.jetbrains.kotlin.plugin.serialization'
 }
 
+ext {
+    ktor_version = '3.0.3'
+}
+
 dependencies {
     implementation project(":core:tools")
     implementation project(":core:events")
@@ -12,6 +16,13 @@ dependencies {
     implementation project(":infrastructure:tools:filesystem")
     implementation project(":core:artifacts")
     implementation project(":core:artifacts-store")
+
+    // Web research tools (web_search, web_fetch) + deterministic HTML→markdown extraction.
+    implementation 'org.jsoup:jsoup:1.20.1'
+    implementation "io.ktor:ktor-client-core:$ktor_version"
+    implementation "io.ktor:ktor-client-cio:$ktor_version"
+
+    testImplementation "io.ktor:ktor-client-mock:$ktor_version"
 }
 
 tasks.named("koverVerify").configure { enabled = false }

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/extract/ExtractionResult.kt

@@ -1,4 +1,4 @@
-package com.correx.infrastructure.research.extract
+package com.correx.infrastructure.tools.extract
 
 /**
  * Outcome of extracting a fetched page (research-workflow-spec §5). The cleaned [markdown] is the

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/extract/HtmlMarkdownExtractor.kt

@@ -1,4 +1,4 @@
-package com.correx.infrastructure.research.extract
+package com.correx.infrastructure.tools.extract
 
 import org.jsoup.Jsoup
 

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/extract/MainContentSelector.kt

@@ -1,4 +1,4 @@
-package com.correx.infrastructure.research.extract
+package com.correx.infrastructure.tools.extract
 
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/extract/MarkdownRenderer.kt

@@ -1,4 +1,4 @@
-package com.correx.infrastructure.research.extract
+package com.correx.infrastructure.tools.extract
 
 import org.jsoup.nodes.Element
 import org.jsoup.nodes.Node

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/web/WebFetchTool.kt

@@ -1,4 +1,4 @@
-package com.correx.infrastructure.research.web
+package com.correx.infrastructure.tools.web
 
 import com.correx.core.approvals.Tier
 import com.correx.core.events.events.ToolRequest
@@ -9,8 +9,8 @@ import com.correx.core.tools.contract.ToolCapability
 import com.correx.core.tools.contract.ToolExecutor
 import com.correx.core.tools.contract.ToolResult
 import com.correx.core.tools.contract.ValidationResult
-import com.correx.infrastructure.research.extract.ExtractionQuality
-import com.correx.infrastructure.research.extract.HtmlMarkdownExtractor
+import com.correx.infrastructure.tools.extract.ExtractionQuality
+import com.correx.infrastructure.tools.extract.HtmlMarkdownExtractor
 import io.ktor.client.HttpClient
 import io.ktor.client.request.prepareGet
 import io.ktor.client.statement.bodyAsChannel

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/web/WebSearchTool.kt

@@ -1,4 +1,4 @@
-package com.correx.infrastructure.research.web
+package com.correx.infrastructure.tools.web
 
 import com.correx.core.approvals.Tier
 import com.correx.core.events.events.ToolRequest

infrastructure/tools/src/test/kotlin/com/correx/infrastructure/tools/extract/HtmlMarkdownExtractorTest.kt

@@ -1,4 +1,4 @@
-package com.correx.infrastructure.research.extract
+package com.correx.infrastructure.tools.extract
 
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Assertions.assertFalse

infrastructure/tools/src/test/kotlin/com/correx/infrastructure/tools/web/WebSearchToolTest.kt

@@ -1,4 +1,4 @@
-package com.correx.infrastructure.research.web
+package com.correx.infrastructure.tools.web
 
 import com.correx.core.approvals.Tier
 import com.correx.core.events.events.ToolRequest