Apply review amendments: fix prose, restructure conclusion and next steps, remove planning meta

- Fix comma splice in conclusion, split long opening sentence
- Add async to createServerAgentSession snippet
- Rewrite conclusion to synthesize rather than restate
- Fix link text to match actual post title
- Vary repeated word choices, remove redundancy in markdown section
- Restructure Next Steps with hierarchy (Try / Learn / Build)
- Tighten Ink & Switch tangent, compress streaming markdown subsection
- Add inline CTAs linking to Cloud and source code
- Soften "survives everything" heading
- Set published: false, remove planning meta section

Made-with: Cursor

Author: samwillis