P1-M6-T3: QUICKSTART & release notes

[Rihoj]

Task ID: P1-M6-T3

Finalize QUICKSTART.md, README.md snippets, and a short release note for MVP.

Acceptance criteria:

• Users can follow the quickstart to run the server and test a sample tool

Estimate: 0.5d
Labels:["docs","release","phase:1","milestone:P1-M6"]

Dependencies:

• P1-M1-T5: Integration smoke test #5
• P1-M3-T3: Resources export (resources/resources.go) #14

Project: https://github.com/orgs/rayprogramming/projects/2