chore: agent-server (software-agent-sdk) to v1.31.1

[all-hands-bot]

Bump tracked agent-server / SDK version

Updates the pinned OpenHands software-agent-sdk / agent-server image from v1.31.0 to v1.31.1 (package.json config.agentServerImage, plus the integration-tests.yml, AGENTS.md, and README.md mirrors).

CI + integration tests on this PR run against ghcr.io/openhands/agent-server:1.31.1-python, validating the client against the new server before merge. This does not release the npm package.

Triggered by: software-agent-sdk v1.31.1 — https://github.com/OpenHands/software-agent-sdk/releases/tag/v1.31.1

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Automatically created by the version-bump-prs workflow.

[github-actions]

Endpoint audit

❌ 6 off-contract call(s) — not on the agent-server · classifiers: cloud

Category	Count
❌ Off-contract (not on agent-server)	6
⛔ no known backend	5
↗️ served by cloud	1
➕ Missing API (agent-server has, client lacks)	9
agent-server endpoints	116
client endpoints	111

❌ Not on agent-server (gated, 6)

⛔ (no known backend) — served by no backend we can see (5)

• DELETE /api/meta-profiles/{}
• GET /api/meta-profiles
• GET /api/meta-profiles/{}
• POST /api/meta-profiles/{}
• POST /api/meta-profiles/{}/activate

↗️ served by cloud (1)

• GET /api/shared-events/search

➕ Missing API — agent-server exposes it, client does not implement (9)

• GET /
• GET /api/conversations
• GET /api/conversations/{}/events
• GET /api/conversations/{}/workspace
• GET /api/conversations/{}/workspace/{}
• GET /api/file/archive
• GET /api/init
• POST /api/conversations/{}/load_plugin
• POST /api/init

[openhands-release-bot]

🚀 Released in v1.32.0.