v5.52.0

What's Changed

• test(tui): real-PTY width-resize harness + RED axis-2 fragmentation guards (#540, #541) by @griffinwork40 in #621
• docs(readme): add placeholder demo image above the fold by @griffinwork40 in #624
• chore(agents): remove inert model: frontmatter from vendored agent prompts by @griffinwork40 in #625
• feat(hooks): deliver SessionStart injectContext to the first turn by @griffinwork40 in #618

Full Changelog: v5.51.2...v5.52.0