/release-notes renders as plain grey text with no markdown/color highlighting (single-version and "Show all")

Description

/release-notes output shows as flat, uncolored monospace text ("wall of grey")
instead of the expected styled rendering (white text with commands/code spans
highlighted, e.g. in blue). This happens both when viewing a single version and
when using "Show all" — so it doesn't appear to be specific to either view mode.

Environment

• Claude Code version: 2.1.209
• OS: macOS 27.0 (BuildVersion 26A5378n)
• Terminal: Apple_Terminal
• TERM: xterm-256color
• COLORTERM: truecolor

Steps to reproduce

1. Run /release-notes in Claude Code CLI
2. View a single version, or select "Show all"
3. Observe output renders as plain grey text with no color segregation between

prose and inline code/commands (backticks not highlighted)

Expected behavior

Release notes should render with the normal markdown styling — white/foreground
text with inline code (backtick spans, command names) highlighted in a distinct
color, as they did in earlier versions.

Actual behavior

All text renders in a single uniform grey/monospace style with no visual
distinction for code spans.