docs: top-notch README, streaming docs, combined pattern + 4 runnable examples

[ferhimedamine]

What

• README: badges (npm/CI/license/TS), expanded options tables with types, streaming example, Pattern 3 (combined), shared-client example, troubleshooting section, link to examples dir
• examples/: 4 standalone runnable scripts with tsx
  • 01-middleware.ts — transparent recall + store across sessions
  • 02-tools.ts — model-driven recallMemory / storeMemory with tool call logging
  • 03-combined.ts — middleware recall + explicit tool persistence, shared DakeraClient
  • 04-streaming.ts — streamText with middleware, note on post-stream persistence
  • examples/package.json + examples/README.md with prereqs and run instructions

Closes / follow-on from

DAK-7289 (founder request: CI green + repo public + readme/docs/examples top notch)

CI

No source changes — CI matrix (typecheck / test / build) passes unchanged.