Added marketing-content-synthesizer skill for generating outcome-led marketing copy across taglines, landing pages, launch posts,...

What changed

Fixed
Channel auth auto-select and hardening for single-channel setups and on-demand channel installs
Fixed
OpenAI token credential writes now persist correctly instead of reverting to expired tokens
Improved
Knot theme refinements: black-and-red palette with WCAG 2.1 AA contrast, config icons for Diagnostics/CLI/Secrets/ACP/MCP sections
Improved
Upgraded to OpenClaw 2026.3.23-2 with upstream highlights including Qwen (Alibaba Cloud Model Studio) endpoint consolidation for China and global regions