feat(grep): added grep CLI, diff highlighting, FileReader abstraction, and markdown improvements

- Added grep CLI subcommand with support for pattern matching, file globbing, context lines, and multiple output modes (content, files-with-matches, count).
- Added diff syntax highlighting support with distinct colors for inserted and deleted lines in code output.
- Implemented FileReader abstraction for cross-platform file reading with mmap support and 4MB size limit.
- Refactored worker pool initialization to support both compiled and development build environments using resolveWorkerSpecifier utility.
- Enhanced markdown rendering with improved inline style context handling and blockquote formatting with text wrapping.
- Replaced external strip-ansi dependency with Bun's built-in stripANSI method across all packages.

packages/coding-agent/src/modes/theme/theme.ts

@@ -2049,6 +2049,8 @@ function getHighlightColors(t: Theme): NativeHighlightColors {
 			type: t.getFgAnsi("syntaxType"),
 			operator: t.getFgAnsi("syntaxOperator"),
 			punctuation: t.getFgAnsi("syntaxPunctuation"),
+			inserted: t.getFgAnsi("toolDiffAdded"),
+			deleted: t.getFgAnsi("toolDiffRemoved"),
 		};
 	}
 	return cachedHighlightColors;