Add OpenHands to compatible clients

[VascoSch92]

OpenHands is an open-source platform for AI software development agents that
write code, run commands, and use tools in a sandboxed workspace.

• Homepage: https://openhands.dev/
• Source: https://github.com/OpenHands/software-agent-sdk (the Agent Plugins loader); product: https://github.com/OpenHands/OpenHands
• Setup documentation: Agent Plugins Packages, and installing plugins in Agent Canvas

Surface

One listing for the OpenHands product family. Agent Plugins packages load
through the same plugin path OpenHands uses everywhere: a directory with a root
plugin.json is detected as an Agent Plugins package ahead of the legacy
layout, and is installed and attached like any other plugin (Agent Canvas UI,
or Conversation(plugins=[...]) programmatically). OpenHands implements
version 1.0.0 of the specification and uses the dev.openhands extension
namespace for its client-specific components.

• openhands-sdk / openhands-agent-server >= 1.49.2
  (release,
  format registered in feat(plugin): add the Agent Plugins mcp.json loader OpenHands/software-agent-sdk#5093)
• OpenHands app: next release after v1.20.0 (pending)

Evidence

Every item on the client conformance checklist
is mapped to a named test in
this table;
all 228 Agent Plugins tests pass at the v1.49.2 tag. The suite loads a vendored
copy of agent-plugins-example
(5f3f508) and purpose-built packages through the public Plugin.load() path
(OpenHands/software-agent-sdk#5160).

• Skills — discovered from skills/ only, each skill isolated at its own
  failure boundary; skill resources travel with the skill. Covered by
  TestVendoredExample, TestFixedLocations, TestFailureBoundaries, plus an
  end-to-end test that runs a conversation and asserts the skills reach the
  agent (tests/sdk/conversation/test_local_conversation_agent_plugins.py).
• MCP stdio — mcp.json (no leading dot) with closed-document and
  per-entry validation; commands resolved as single tokens; PLUGIN_ROOT and a
  dedicated persistent PLUGIN_DATA provided, with ${PLUGIN_ROOT} /
  ${PLUGIN_DATA} expanded only in args, env values and cwd; working
  directory contained in the plugin root. Covered by TestStdioDefaults,
  TestPlaceholderExpansion, TestFailureBoundaries, and the end-to-end test
  asserting the constructed server.
• MCP streamable-http — declared transport carried to the connection;
  URL and header requirements enforced (plain http only for loopback,
  client-generated headers dropped, headers never expanded). Covered by
  TestFixedLocations::test_the_declared_transport_is_the_one_carried and
  TestRemote in tests/sdk/plugin/test_agent_plugins_mcp.py.

sse is not claimed: entries declaring it are reported and skipped, as §7.2.2
rule 4 allows.

Logos

Official OpenHands logotype (mark + wordmark), light and dark SVG variants,
byte-identical to the brand assets published on openhands.dev:

• light: https://www.openhands.dev/assets/webflow/brand/openhands-logo-full.svg
• dark: https://www.openhands.dev/assets/webflow/brand/openhands-logo-full-on-dark.svg

pnpm build passes.

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