fix(tools): recognized zip-family archives and pruned unconvertible extensions

- Treated ZIP-based .jar/.war/.ear/.apk as zip archives in archiveFormatFromPath and parseArchivePathCandidates so read/write member access works.
- Shared one archive-extension alternation between format detection and path splitting to stop them drifting.
- Derived the markit convertible-extension set from a single source of truth (utils/markit) matching the registered converters (pdf/docx/pptx/xlsx/epub), dropping legacy .doc/.ppt/.xls/.rtf that had no converter and only produced Unsupported format errors.
- Updated read/write tool prompts to document the zip-family extensions.

Fixes #5808

packages/coding-agent/src/cli/file-processor.ts

@@ -9,13 +9,12 @@ import chalk from "chalk";
 import { resolveReadPath } from "../tools/path-utils";
 import { formatBytes } from "../tools/render-utils";
 import { formatDimensionNote, resizeImage } from "../utils/image-resize";
-import { convertFileWithMarkit } from "../utils/markit";
+import { CONVERTIBLE_EXTENSIONS, convertFileWithMarkit } from "../utils/markit";
 
 // Keep CLI startup responsive and avoid OOM when users pass huge files.
 // If a file exceeds these limits, we include it as a path-only <file/> block.
 const MAX_CLI_TEXT_BYTES = 5 * 1024 * 1024; // 5MB
 const MAX_CLI_IMAGE_BYTES = 25 * 1024 * 1024; // 25MB
-const CONVERTIBLE_EXTENSIONS = new Set([".pdf", ".doc", ".docx", ".ppt", ".pptx", ".xls", ".xlsx", ".rtf", ".epub"]);
 
 export interface ProcessedFiles {
 	text: string;