docs: add book purchase link and credit Eric Jorgenson

feat: broaden skills beyond manufacturing with bridge lines and domain heuristics

refactor: retire monolith, promote skills to standalone

refactor: rename ElonBrain to ElonStack everywhere

feat: add Pass 6 Reality Check with web research verification

feat: move ElonBrain to root SKILL.md as /elonstack

chore: add Plans/ and docs/ to gitignore

docs: add team, org, and Cowork install paths to README

fix: address code review findings (11 issues)

feat: add README with install, usage, and example output

feat: add ElonBrain hero skill and 5 standalone pass skills

fix: address spec review issues in quotes.yaml

feat: extract quotes from Book of Elon into quotes.yaml

Initial commit