[arsalann]

Linear: BRU-6682

Follow-up to #4. Replaces marketing phrasing with direct descriptions. No change to commands, links or behaviour.

What changed

• README.md
  • Top: the tagline and the "without the confident wrong number" hook are replaced by a plain description of startup-data-kit.
  • "Try it in 2 minutes" is renamed "Try it with sample data", and the note now says what --full-refresh does.
  • "What is here", the Slack paragraph and "Or copy the folder" are reworded without slang.
  • "What these are written to prevent" is renamed "What the skills cover" and reworded.
  • Smaller wording fixes in the upstream, credentials and contributing sections.
• resources/startup-data-kit/README.md: "The joins are where the value is" becomes "Questions that span domains", plus related wording.
• ai-coding-spend/sample-data/README.md: the heading becomes "Try it", and the "two traps" line is reworded.
• CONTRIBUTING.md: the opening paragraph is reworded, and "genuinely" is removed twice.
• demo/ai-coding-spend.tape: the header comment no longer says "2 minutes". This comment is not shown in the GIF, so the GIF is unchanged.

Verification

• ./tests/check.py: ok, 0 warnings.

Not changed

• The skill files that instruct the agent: the "Traps" headings in analysis.md, and the investor line in revenue-analytics/SKILL.md. These are agent instructions, not user docs.

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