feat: add quality references and enhance build/verify/ship agents

Add references/ with 4 checklists (security, testing, performance,
launch) covering Go and PHP. Enhance build agent with implementation
cycle and vertical slices. Expand verify with 5-axis code review.
Add staged rollout and pre-launch gate to ship. All three agents
now include anti-rationalization tables.

feat: embed framework files and extract on helm init

agents/, rules/, schemas/, CLAUDE.md, and .claude/commands/ are now
embedded in the binary via go:embed. helm init extracts them into the
project directory, skipping files that already exist.