Add SeqLog to Proprietary

[nekocode]

Adding SeqLog to the Proprietary section.

Disclosure: I am the author.

SeqLog is a native macOS outliner in the Logseq/Roam lineage, built with Swift/SwiftUI/AppKit and a Rust core rather than Electron.

Why it belongs on a list that tracks storage format so carefully: the Markdown files are the database. There is no index and no sidecar DB, so search is ripgrep over the folder and any external tool, including a coding agent pointed at the vault, sees exactly what the app sees. That property became less common after Logseq 2.0 moved its source of truth into SQLite.

Checklist:

• Category: Proprietary. Free forever on macOS, signed and notarized, distributed outside the App Store.
• Icons: 📖 plain-text storage, 🔁 built-in sync via an embedded Git client (libgit2, push/pull to any remote).
• No 🍎 yet. iOS exists but has not shipped.
• Actively maintained: 26 releases, latest 1.12.x.
• Entry is alphabetical, description is two sentences ending with a period.

I did not add a row to the Quick Comparison table since that section is scoped to the most-searched tools.