docs(install): fix macOS Homebrew install to use official cask

[senamakel]

The old instructions referenced brew tap tinyhumansai/core && brew install openhuman which doesn't work because no formula exists in that tap.

The correct approach is brew install --cask openhuman using the official Homebrew/homebrew-cask package.

Fixes #3692

[coderabbitai]

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• INSTALL.md

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_{Comment @coderabbitai help to get the list of available commands.}

[greptile-apps]

Greptile Summary

This PR fixes the macOS Homebrew install instructions in INSTALL.md, replacing a broken two-step tap-based command (brew tap tinyhumansai/core && brew install openhuman) with the single official cask command (brew install --cask openhuman).

• The old tap name (tinyhumansai/core) appears to have been incorrect; the fix pointing users to the Homebrew Cask is a cleaner, officially-supported path for a Tauri desktop app.
• One open question: .github/workflows/release-packages.yml still smoke-tests installation via brew tap tinyhumansai/openhuman && brew install openhuman (a different tap from the broken one), so it's worth confirming whether that tap is still maintained or should also be updated to use --cask.

Confidence Score: 5/5

Safe to merge — the change is confined to a single documentation file and corrects a broken install command.

The only changed file is INSTALL.md, which replaces a clearly non-functional tap reference with the official cask command. The sole follow-up worth tracking is whether the release-packages CI smoke test (which still uses a different tap) should also be migrated, but that does not block correctness of this doc fix.

No files require special attention; the optional follow-up is .github/workflows/release-packages.yml if the tinyhumansai/openhuman tap is also being retired in favour of the cask.

Important Files Changed

Filename	Overview
INSTALL.md	Replaces broken two-step tap install (tinyhumansai/core) with brew install --cask openhuman; a working tap (tinyhumansai/openhuman) referenced in CI is not addressed.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[User wants to install OpenHuman on macOS] --> B{Install method}
    B -->|Old docs| C[brew tap tinyhumansai/core]
    C --> D[brew install openhuman]
    D --> E[❌ Fails — no formula in tap]
    B -->|New docs this PR| F[brew install --cask openhuman]
    F --> G[✅ Official Homebrew Cask]
    B -->|CI release-packages.yml| H[brew tap tinyhumansai/openhuman]
    H --> I[brew install openhuman]
    I --> J[⚠️ Still used in CI smoke test — not updated by this PR]

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[greptile-apps]

Docs and CI now describe two different install paths

The user-facing docs now recommend brew install --cask openhuman, but the release-packages CI workflow still verifies installation using brew tap tinyhumansai/openhuman && brew install openhuman (.github/workflows/release-packages.yml, lines 217–218). Notably, the tap referenced in CI is tinyhumansai/openhuman — not tinyhumansai/core as the old docs had — which suggests that tap may be a live, working formula rather than a broken one. If both paths work (tap formula and cask), the docs should probably pick one definitively; if the tap is also being deprecated, the CI smoke test should be updated to use brew install --cask openhuman to match.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!