[preset] Update SpecAssay preset to v0.4.12

[github-actions]

Updates the specassay community preset from v0.3.4 to v0.4.12.

Changes

• presets/catalog.community.json: updated version, download_url, and updated_at for the specassay entry. created_at preserved from original.

Validation Results

All checks passed:

• ✅ Preset ID specassay matches ^[a-z][a-z0-9-]*$
• ✅ Version 0.4.12 is valid semver
• ✅ Repository https://github.com/rdryfoos/specassay is publicly accessible
• ✅ preset.yml found at presets/specassay/preset.yml (monorepo layout)
• ✅ LICENSE file present
• ✅ Documentation URL points to preset-scoped presets/specassay/README.md on GitHub, contains specify preset add --from <exact download URL>
• ✅ GitHub release v0.4.12 exists
• ✅ All submission checklists checked

Closes #4253
cc @rdryfoos

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