feat: replaced custom mupdf wasm pipeline with native function

- Replaced the custom MuPDF-WASM PDF extraction and rendering pipeline with the new `pdfToMarkdown` native function from `@oh-my-pi/pi-natives`.
- Removed legacy MuPDF extraction modules, WASM embedding scripts, and PDF image extraction tools.
- Added OCR warnings and browser/text redirection for unsupported PDF image reads.
- Updated native package definitions, documentation, and test suites for the new PDF inspection capability.

package.json

@@ -61,7 +61,6 @@
       "ghostty-web": "^0.4.0",
       "lint-staged": "^17.0.8",
       "lucide-react": "^1.24.0",
-      "mupdf": "^1.28.0",
       "onnxruntime-node": "1.26.0",
       "postcss": "^8.5.16",
       "prettier": "^3.9.5",
@@ -170,8 +169,6 @@
     "gen:nix": "bun scripts/gen-nix-bun.ts",
     "gen:tool-views": "bun --cwd=packages/collab-web run gen:tool-views",
     "gen:bundle": "bun --cwd=packages/coding-agent run gen:bundle",
-    "gen:mupdf": "bun --cwd=packages/coding-agent run gen:mupdf",
-    "gen:mupdf:reset": "bun --cwd=packages/coding-agent run gen:mupdf:reset",
     "gen:native": "bun --cwd=packages/natives run gen:native",
     "gen:native:reset": "bun --cwd=packages/natives run gen:native:reset",
     "check-spoofed-versions": "bun scripts/check-spoofed-versions.ts"