[ishan-jawale]

Summary

Enable bundled Python setup and native DMG packaging for Intel Macs running macOS 15 or newer, using the same pinned dependencies as existing platforms.

Changes

• Add the checksum-pinned macOS x64 Python 3.12.14 runtime.
• Configure native GitHub runners to build separate Intel and Apple Silicon installers.
• Reject incompatible Electron or Python architectures before replacing package output; verify packaged imports, FAISS vector search, and app signatures.
• Fix packaging and integration-test paths containing spaces, and document Intel setup and packaging requirements.

Validation

Validated on Intel macOS 15.7.9:

• 367 TypeScript and 115 Python unit tests passed, along with both type checks and the production build.
• PDF worker integration and 16/16 mocked conversation contracts passed. Real Ollama CPU retrieval passed with acceleration enabled, disabled, and re-enabled.
• The pinned BuzzDB benchmark passed 16/16 retrieval questions. This measures evidence coverage, not generated-answer accuracy.
• Intel DMG build, checksum, mounting, and ad-hoc app signature verification passed. The installed app passed startup, device detection, PDF preview, indexing, and hybrid search after relocation to a path containing spaces.

Notes

Intel uses Ollama's CPU runtime. Native Apple Silicon, Windows, and Linux installer builds were not run locally; the macOS release workflow still needs CI verification.