feat(adk): add jsonschema descriptions to filesystem tool arguments

Add detailed JSON Schema descriptions to all filesystem tool argument
structs for better AI model understanding and tool invocation.

Changes:
- readFileArgs: Added descriptions for file_path, offset, and limit fields
- writeFileArgs: Added descriptions for file_path and content fields
- editFileArgs: Added descriptions for file_path, old_string, new_string,
  and replace_all fields with default value annotation
- globArgs: Added descriptions for pattern and path fields
- grepArgs: Added comprehensive descriptions for all 14 fields including
  pattern, path, glob, output_mode (with enum values), context options
  (-A/-B/-C), line numbers, case sensitivity, file type, pagination
  (head_limit/offset), and multiline mode

Also updated tool descriptions in prompt.go:
- WriteFileToolDesc: Improved usage guidelines with clearer instructions
- GlobToolDesc: Simplified description focusing on key capabilities

This enhancement enables LLM-based agents to better understand tool
parameters and generate more accurate tool calls.

Author: zhuangjie1125

_typos.toml

@@ -9,6 +9,6 @@ InvokableRun = "InvokableRun"
 typ = "typ"
 byted = "byted"
 cpy = "cpy"
-
+mak = "mak"
 [files]
 extend-exclude = ["go.mod", "go.sum", "check_branch_name.sh"]

adk/filesystem/backend.go

@@ -36,8 +36,8 @@ type GrepMatch struct {
 	// Path is the file path where the match was found.
 	Path string
 
-	// LineNumber is the line number where the match was found.
-	LineNumber int
+	// Line is the 1-based line number of the match.
+	Line int
 
 	// Count is the total number of matches found in the file.
 	Count int