docs: add runnable examples and trust verification page

[TDamiao]

Summary

• add runnable example entrypoints in examples/*.mjs
• add examples/README.md with run commands and expected output notes
• add external-reference example (rsi vs technicalindicators) for trustable example validation
• add docs/trust.md with CI/release/compat verification guidance
• link examples and trust documentation from README
• add npm scripts for single example runs and aggregate smoke run (example:all)

Validation

• npm.cmd run example:all (PASS)
  • RSI signal table rendered
  • batch vs streaming VWAP parity printed
  • funding metrics output printed
  • RSI compat check vs external lib returned PASS

Closes #5
Closes #24