[codex] Add DLL viewer

[phodal]

What changed

• Adds a browser-side Portable Executable parser for Windows DLL/EXE/SYS/OCX files.
• Adds a debug DLL viewer at /debug/dll-viewer with PE summary, sections, data directories, imports, exports, warnings, and raw JSON.
• Adds parser characterization tests and i18n strings for the debug surface.

Base

This PR is intentionally based on codex/office-wasm-poc-renderer-clean so the diff only contains the DLL viewer increment on top of the Office WASM clean branch.

Validation

• npx vitest run src/client/dll-viewer/__tests__/pe-parser.test.ts
• npx tsc --noEmit --pretty false
• npx eslint --max-warnings=0 src/app/debug/dll-viewer/page-client.tsx src/client/dll-viewer/pe-parser.ts src/client/dll-viewer/__tests__/pe-parser.test.ts
• agent-browser smoke: uploaded /Users/phodal/Downloads/kernel32/kernel32.dll to /debug/dll-viewer; parsed PE32+ x86-64, 7 sections, 1631 exports, 96 imports, no parser warnings.
• entrix run --tier fast -> 100.0% PASS

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