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[kotlin] Add kotlin-type-mapper infrastructure (#6795)

* feat(kotlin): add KotlinNodeTypeData with package-private setters and InternalApiBridge

KotlinNodeTypeData stores type-mapper results on AST nodes via DataMap.
Setters are package-private; InternalApiBridge exposes them to callers
outside the types package (e.g. KotlinLanguageProcessor).

* feat(kotlin): add KotlinTypeAnalysisContext and holder with kotlin-type-mapper deps

Add KotlinTypeAnalysisContext (indexes call sites, declarations, type
hierarchy from TypedAst) and KotlinTypeAnalysisContextHolder (global +
thread-local slots). Add kotlin-type-mapper-model and -analyzer deps.

* feat(kotlin): integrate kotlin-type-mapper AST annotation phase

Add KotlinTypeAnnotationVisitor, AnnotationAttributeAnnotator, and
DelegationSpecifierAnnotator to walk parsed ASTs and set @TypeName /
@ReturnTypeName attributes on declaration nodes. KotlinLanguageProcessor
now runs kotlin-type-mapper before parsing and annotates each file via
InternalApiBridge; falls back gracefully when no auxClasspath is set.

* test(kotlin): expand KotlinTypeAnnotationVisitorTest to full visitor coverage

9 tests covering all node types with specific type assertions:
PropertyDeclaration, FunctionDeclaration, CatchBlock, ForStatement (loop var
+ collection param), ClassParameter, ClassDeclaration (simple name without
package; FQN with package declaration), annotation FQN. Uses
KotlinParsingHelper for production-like parsing.

* fix(kotlin): upgrade ktm to 0.5.1, fix NPE, add missing tests

- Upgrade kotlin-type-mapper deps from 0.5.1-SNAPSHOT to 0.5.1
- Add delegation specifier tests (superclass + interface) to KotlinTypeAnnotationVisitorTest
- Add KotlinAuxClasspathIntegrationTest: end-to-end auxClasspath flow
- Remove KotlinNodeTypeDataTest.typeInfoAvailableFalseWhenNotSet (always failed)
- Add KotlinTypeAnalysisContextHolder.clear() to test teardown
- Add kotlin-type-mapper attribution to kotlin.md docs
- Fix NPE in KotlinAux... (continued)

19328 of 25381 branches covered (76.15%)

Branch coverage included in aggregate %.

296 of 369 new or added lines in 11 files covered. (80.22%)

41976 of 52058 relevant lines covered (80.63%)

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