Two errors caught by the docs build CI on PR #98:
1. external-agents.mdx line 15 had `<1 min.` — the literal `<` made the
MDX parser try to read it as a JSX tag opener. Replaced with prose
"under a minute" — equivalent meaning, no escape gymnastics.
2. claude-code-channel-plugin.md used `<Callout type="info">` JSX, but
the rest of /content/docs/guides/ is plain .md (no JSX). The .md
loader can't resolve the Callout component → "Cannot handle unknown
node `raw`". Replaced with a `> **Note:**` blockquote — same visual
hierarchy, plain markdown.
Verified locally that the offending characters are gone; build CI on
push will re-run and should now pass.
c5421c61f5