fix(server): wait for web search plugin activation

[Hona]

• Wait for Location plugin activation before listing web-search providers or running queries, including debounced reloads. Keep registration asynchronous and plugin-internal reads non-blocking.
• Cover immediate requests during startup and reload with an explicit activation gate, without sleeps or retries.
• Correct the SDK subscriber-abort assertion to expect clean iterator completion. Host-close and source-failure behavior is unchanged.

yield* opencode.plugin(plugin)
yield* opencode.websearch.query({ providerID, query: "opencode", location })

[Copilot]

🟡 Changes recommended

The updated Promise subscription-abort test expectation doesn’t match the current embedded fetch/SSE implementation, which surfaces abort as a transport error.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR ensures web search routes don’t observe an empty/partial plugin-backed provider registry during Location startup or plugin reload by gating provider listing and queries on plugin activation, and updates SDK tests to reflect the intended subscription abort semantics.

Changes:

• Gate websearch.providers and websearch.query handlers on Plugin.awaitActivation to avoid reading plugin-provided state before activation settles.
• Add an embedded test that asserts web search calls block until plugin activation completes during both startup and reload scenarios.
• Update the Promise SDK event-subscription abort test expectation.

File summaries

File	Description
packages/server/src/handlers/websearch.ts	Adds an activation gate before listing providers and running web search queries.
packages/sdk/test/promise.test.ts	Changes the expected behavior when aborting a Promise event subscription.
packages/sdk/test/embedded.test.ts	Adds coverage ensuring web search waits for plugin activation during startup and reload.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 1
• Review effort level: Lite

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