Docs: fix README links and typos

[enyst]

Fixes a few small doc issues:

• README: update the GitHub Repository link to this repo
• AGENTS: correct a few typos in the dev setup section
• tests/README: fix the directory tree formatting and remove trailing whitespace

Co-authored-by: openhands openhands@all-hands.dev

---

Agent Server images for this PR

• GHCR package: https://github.com/OpenHands/agent-sdk/pkgs/container/agent-server

Variants & Base Images

Variant	Architectures	Base Image	Docs / Tags
java	amd64, arm64	eclipse-temurin:17-jdk	Link
python	amd64, arm64	nikolaik/python-nodejs:python3.12-nodejs22	Link
golang	amd64, arm64	golang:1.21-bookworm	Link

Pull (multi-arch manifest)

# Each variant is a multi-arch manifest supporting both amd64 and arm64
docker pull ghcr.io/openhands/agent-server:721ef7f-python

Run

docker run -it --rm \
  -p 8000:8000 \
  --name agent-server-721ef7f-python \
  ghcr.io/openhands/agent-server:721ef7f-python

All tags pushed for this build

ghcr.io/openhands/agent-server:721ef7f-golang-amd64
ghcr.io/openhands/agent-server:721ef7f-golang_tag_1.21-bookworm-amd64
ghcr.io/openhands/agent-server:721ef7f-golang-arm64
ghcr.io/openhands/agent-server:721ef7f-golang_tag_1.21-bookworm-arm64
ghcr.io/openhands/agent-server:721ef7f-java-amd64
ghcr.io/openhands/agent-server:721ef7f-eclipse-temurin_tag_17-jdk-amd64
ghcr.io/openhands/agent-server:721ef7f-java-arm64
ghcr.io/openhands/agent-server:721ef7f-eclipse-temurin_tag_17-jdk-arm64
ghcr.io/openhands/agent-server:721ef7f-python-amd64
ghcr.io/openhands/agent-server:721ef7f-nikolaik_s_python-nodejs_tag_python3.12-nodejs22-amd64
ghcr.io/openhands/agent-server:721ef7f-python-arm64
ghcr.io/openhands/agent-server:721ef7f-nikolaik_s_python-nodejs_tag_python3.12-nodejs22-arm64
ghcr.io/openhands/agent-server:721ef7f-golang
ghcr.io/openhands/agent-server:721ef7f-java
ghcr.io/openhands/agent-server:721ef7f-python

About Multi-Architecture Support

• Each variant tag (e.g., 721ef7f-python) is a multi-arch manifest supporting both amd64 and arm64
• Docker automatically pulls the correct architecture for your platform
• Individual architecture tags (e.g., 721ef7f-python-amd64) are also available if needed

[all-hands-bot]

🟢 Good taste - Clean documentation fixes. Typos corrected, broken link fixed, formatting improved. LGTM!

[xingyaoww]

Thank you!