OpenSquilla 0.5.4 maintenance release

🦐 OpenSquilla 0.5.4 is a maintenance release for the 0.5 stable line. It adds versioned HTML editing, optional Runtime Packs, per-chat model strategies, and broad reliability improvements. Upgrading from 0.5.3 preserves existing configuration, chats, Agents, memory, and scheduled jobs.

📝 Versioned HTML editing (beta) — Electron Desktop can now edit single-file UTF-8 HTML attachments and deliverables through Preview, Source, Versions, and Changes views. Agent-generated candidates stay separate until you commit them, with review and whole-version revert controls.

📦 Runtime Packs and slimmer installers — Python, Node.js, and Windows Git Bash can be installed or removed on demand from Settings. Downloads support integrity checks, resume, cancellation, and GitHub/Beijing OSS fallback, while system runtimes remain untouched.

🧠 Smarter model routing — each chat can use Direct, Router, or Ensemble independently. C3 multi-model fusion gains resilient fallback and transactional tool attempts, while Qwen, Zhipu, Gemini, custom pricing, routed cost accounting, and reasoning retries are improved.

💬 Chats, tasks, and attachments — durable turn saves no longer delay answers, activity ordering and scrolling recover across reconnects, stopping waits for filesystem safety, and large attachments can use the full request capacity. History pagination, prompt-cache continuity, slash commands, paste handling, and repeated tool output are also more robust.

🖥️ Desktop, Web, and platform reliability — Desktop startup is decoupled from Gateway readiness, recovery is faster, macOS Keychain failures have guided retry, and Windows process trees and install progress are handled more predictably. Settings, sidebars, Workbench resizing, automation states, memory import, and global controls have also been refined.

Upgrading: quit the running Desktop app or gateway, install 0.5.4 directly over 0.5.3, and restart OpenSquilla. Existing configuration, chats, Agents, memory, and scheduled jobs are preserved; additive database migrations run automatically. Desktop installers, the Python wheel, and ghcr.io/opensquilla/opensquilla:v0.5.4 are available from the official release.