[Feedback] Collect early experience from Mac + Obsidian users

[Longfellow1]

Background

The first public learning goal is not star count. It is whether Mac and Obsidian users understand the workflow, trust the privacy model, and find the daily note worth reviewing.

Task

Collect structured early feedback from people who try or inspect KeyPulse.

Acceptance criteria

• Ask whether the README explains the project in 10 seconds
• Ask whether the privacy model feels credible
• Ask whether the Obsidian workflow feels native
• Ask whether the daily note output would be worth reviewing
• Categorize feedback in docs/growth-log.md