chore: CREDITS, bin entrypoint, cross-platform hook, CI verify, plugin fixes

[KailasMahavarkar]

Summary

• CREDITS.md - acknowledge obra/superpowers (MIT © Jesse Vincent) for the enforcement prose pattern (Iron Laws, 1% Rule, rationalization tables). Also credits cognitive psychology research and book references used in designer/design-patterns-skill.
• README.md - add Acknowledgements section at the bottom linking to CREDITS.md; update architecture tree for bin/
• bin/hyperstack.mjs - cross-platform Node wrapper that boots src/index.ts via tsx. Replaces dist/index.js as the published bin target - no build step needed.
• hooks/session-start.mjs - cross-platform SessionStart hook replacing the bash-only session-start script. Works on Windows, macOS, and Linux.
• hooks/hooks.json + hooks-cursor.json - updated hook command to use node session-start.mjs
• install.md - updated local install instructions to reference bin/hyperstack.mjs
• package.json - move tsx from devDeps to deps (required at runtime via bin), add test script, update bin entrypoint
• .github/workflows/publish.yml - add verify job (matrix: ubuntu/macos/windows × Node 18/20/24) that runs tests + type-check before the Docker push job
• tests/ - initial test suite covering generator and workflow behaviour
• fix(designer) - component name extraction now preserves multi-word names instead of taking only the first word
• fix(lenis) - useReducedMotion rewritten to be SSR-safe using useEffect + addEventListener
• fix(motion) - correct component signatures for stagger/exit/layout variants; fix useEffect missing animate in dep array
• fix(reactflow) - store code is now inlined directly instead of wrapped in a comment block; missing xyflow type imports added

Test plan

• npm install succeeds
• node bin/hyperstack.mjs starts the MCP server
• npm test runs without errors
• npm run build (tsc --noEmit) passes
• CI verify matrix passes on push

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