feat: consolidate file write, move, grep, and delete operations into unified tools and update context compaction heuristics

docs/ToolConsolidation.md

@@ -49,7 +49,7 @@ public static string MoveFile(
 - Both create parent directories
 - Similar error handling patterns
 
-## 3. Grep Operations
+## 4. Grep Operations ✅ DONE
 
 **Current tools:** `GrepFile`, `GrepRecursive`
 
@@ -59,13 +59,13 @@ public static string MoveFile(
 public static string Grep(
     string path,
     string pattern,
-    bool recursive = false,
+    string mode = "recursive",
     string? filePattern = null)
 ```
 
 **Behavior:**
-- `recursive=false` - Searches single file (current GrepFile)
-- `recursive=true` - Searches directory recursively (current GrepRecursive)
+- `mode="file"` - Searches single file (current GrepFile)
+- `mode="recursive"` - Searches directory recursively (current GrepRecursive)
 - `filePattern` - Optional glob to filter files when recursive
 
 **Benefits:**
@@ -73,7 +73,7 @@ public static string Grep(
 - Reduces 2 tools to 1
 - Cleaner API for LLM
 
-## 4. Delete Operations
+## 5. Delete Operations ✅ DONE
 
 **Current tools:** `DeleteFile`, `DeleteDir`
 
@@ -82,31 +82,24 @@ public static string Grep(
 ```csharp
 public static string Delete(
     string path,
-    bool recursive = true)
+    string mode = "file")
 ```
 
 **Behavior:**
-- Auto-detects if path is file or directory
-- `recursive=true` - Delete directory and all contents
-- `recursive=false` - Only matters for directories (error if not empty)
+- `mode="file"` - Deletes a file
+- `mode="dir"` - Deletes a directory (recursive)
 
 **Benefits:**
-- Auto-detects file vs directory
+- Unified interface for all deletion
 - Similar error handling patterns
 - Reduces 2 tools to 1
 
-## Summary
+These consolidations reduced the tool count from 17 to 13 tools (4 completed), making the API simpler and easier for the LLM to use effectively.
 
-These consolidations would reduce the tool count from 17 to 13 tools, making the API simpler and easier for the LLM to use effectively.
+**Completed merges**:
+1. ✅ File Move Operations (2 → 1) - **DONE**
+2. ✅ File Write Operations (3 → 1) - **DONE**
+3. ✅ Delete Operations (2 → 1) - **DONE**
+4. ✅ Grep Operations (2 → 1) - **DONE**
 
-**High priority merges:**
-1. ✅ File Write Operations (3 → 1)
-2. ✅ File Move Operations (2 → 1)
-3. ✅ Grep Operations (2 → 1)
-4. ✅ Delete Operations (2 → 1)
-
-**Kept separate:**
-- `ReadFile` - distinct read-only operation
-- `ListDir`, `FindFiles`, `GetFileInfo` - different purposes
-- `CreateDir` - simple enough to keep standalone
-- `ReplaceLines`, `InsertAfter`, `DeleteRange` - too complex to merge without confusing LLM
+**All high priority merges completed!**