Code fixes and repository cleanup #6

Small correctness fixes and housekeeping.

Code

• llms-full.txt: the heading-level bump also rewrites # comment lines inside code blocks into headings (src/pages/llms-full.txt.ts)
• llms.txt and llms-full.txt: tell logs from articles by folder (daily-logs/) instead of the "Activity Log" title prefix
• Posts that share a date have no sort tiebreaker, so their order can change between builds. Choosing a tiebreaker can change the visible order of same-day posts, so confirm it before changing.

Repository

• Replace the Astro starter README with a short project README
• Rename the package from solar-star
• Delete unused src/assets/astro.svg and src/assets/background.svg

The CLAUDE.md rewrite, the old plan and dev-log files, and the committed .playwright-mcp/ screenshots moved to #9.