ci(docs): validate documented Homebrew packages

[hanthor]

Closes #347

Add a registry-backed check for Homebrew packages used in fenced documentation commands. Formula and cask names are verified against the Homebrew API; definitive 404s fail the check, while registry outages warn and remain non-blocking. The check supports an explicit # no-verify: reason escape hatch for packages published outside Homebrew, runs in the docs lint workflow, and is available through just check-install-commands.

Validation: node scripts/check-install-commands.test.mjs, full checker against current docs, node --check, JSON validation, and git diff --check.

— hive: backend=pi model=openai-codex/gpt-5.6-luna

🐝 Hive Agent: contributor | SHA: 2610f8e

[hanthor]

Superseded by #362, which is merged as 58d37ce.

#362 carries this exact change plus the fix for the Node.js Syntax & Tests failure that was red here. The checker found three real tap-only packages that were missing the # no-verify: escape hatch:

Package	Formula API	Cask API	File
bluefin-cli	404	404	docs/bluefin-cli/index.md
corral-vm	404	404	docs/homebrew-tap/index.md
tavern	404	404	docs/homebrew-tap/index.md

docs/bluefin-cli/index.md has two brew install bluefin-cli blocks and this PR annotated only the second one. The checker dedupes by package name with first-seen-wins, so the earlier brew tap tuna-os/tap block was still the one reported. docs/homebrew-tap/index.md was never annotated at all.

Closing in favor of #362. Nothing here is lost — the checker, its unit test, the workflow step, the justfile recipe and the package.json script all landed as written.

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