* docs: add TL;DR tips to dev note and update install instructions
Add a tip block with four key lessons for building agent skills to the
"Data Designer Got Skills" dev note. Remove the Claude Code marketplace
install option from both the blog and README, keeping only the skills.sh
method. Update skill mode descriptions and clarify Claude Code testing scope.
* docs: add sentence about CLI delivering curated context
* docs: fix stray asterisk in README install instructions
* docs: remove claude-plugin marketplace directory
* docs: add skeleton for "Data Designer Got Skills" dev note
* create assets folder and add blog directory name
* docs: add Claude Code plugin marketplace configuration
Register the repo as a Claude Code plugin marketplace so users can
install the data-designer skill via `/plugin marketplace add`.
* docs: write first draft of "Data Designer Got Skills" dev note
Full prose for all sections: intro with hero benchmark figure,
agents as first-class users, baseline trace walkthrough, CLI and
skill design, benchmark results (228 sessions), getting started
with marketplace and npx install paths, and what's next.
* docs: add error breakdown table and minor refinements
* docs: add sdg and data-designer keywords to plugin metadata
* docs: refine CLI framing, reduce em dashes, slop guard pass
* docs: fix grammar in dev note (serial comma, double-which clause)
* update hero image
* docs: swap hero image, move benchmark figure, minor wording tweaks
* docs: add narrative lead-in to skill trace summary
* docs: refine quality bullet, streamline getting started modes
* remove old image
* slope-guard tweaks
