docs: comprehensive README rewrite with full architecture, SKILL anatomy, MCP engine deep dive, and data flow diagrams

chore: bump version to 0.3.1

docs: remove placeholder links and images

feat: full Chinese i18n support

fix: actually commit twine upload action and bump to 0.2.6

chore: bump to 0.2.5 for fresh release attempt

chore: bump to 0.2.4 and fix pypi publish workflow token auth

chore: actual version bump to 0.2.3

chore: bump version to 0.2.3 for testing CD

ci: add automated pypi publishing workflow on release

ci: fix renamed skill validation in workflow

docs: fix incorrect git clone URL and folder name in CONTRIBUTING

docs: add test coverage badge, community links, and demo placeholder

docs: viral README redesign with new copy and visual layout

rename: skills/example → skills/prd for naming consistency