refactor: remove augmentation system and semantic type matching

Remove the entire augmentation pipeline infrastructure (52 files,
~15,000 lines) and the semantic type matching system. These were
unused middleware layers adding complexity without value.

What was removed:
- src/augmentations/ directory (all augmentation implementations)
- src/augmentationManager.ts (pipeline orchestrator)
- src/types/augmentations.ts, src/types/pipelineTypes.ts
- src/shared/default-augmentations.ts
- Semantic type suggestion (BrainyTypes.suggestNoun/suggestVerb)
- src/utils/typeMatching/ (embedding-based type matcher)

What was preserved by relocating:
- Import handlers (CSV, PDF, Excel) -> src/importers/handlers/
- NeuralImportAugmentation -> src/cortex/neuralImportAugmentation.ts
- Type matching utilities -> heuristic inference in consumers

What was simplified:
- brainy.ts: operations call storage directly (no execute() wrapper)
- IntegrationBase: standalone class (no BaseAugmentation parent)
- BrainyTypes: validation-only (nouns, verbs, isValid*, get*)
- Pipeline: direct execution (no augmentation interception)
- index.ts: removed TypeSuggestion, suggestType exports
- package.json: removed stale types/augmentations export

Build passes, 1176 tests pass, 0 failures.

src/mcp/mcpAugmentationToolset.ts

@@ -12,10 +12,6 @@ import {
   MCPTool,
   MCP_VERSION
 } from '../types/mcpTypes.js'
-import { AugmentationType } from '../types/augmentations.js'
-
-// Import the augmentation pipeline
-import { augmentationPipeline } from '../pipeline.js'
 
 export class MCPAugmentationToolset {
   /**
@@ -146,9 +142,8 @@ export class MCPAugmentationToolset {
     
     const { args = [], options = {} } = parameters
     
-    // Note: This MCP toolset needs to be updated to use the new brain.augmentations API
-    // For now, return a placeholder response to fix compilation
-    throw new Error(`MCP toolset requires update to use brain.augmentations API. Method '${method}' not available.`)
+    // Augmentation pipeline has been removed — operations are called directly on brain
+    throw new Error(`MCP augmentation toolset is deprecated. Method '${method}' not available. Use brain API directly.`)
   }
 
   /**
@@ -157,7 +152,7 @@ export class MCPAugmentationToolset {
    * @returns Whether the augmentation type is valid
    */
   private isValidAugmentationType(type: string): boolean {
-    return Object.values(AugmentationType).includes(type as AugmentationType)
+    return false
   }
 
   /**